Actually, as it relates to inciting sedition, Trump pretty much convicted himself. Let's look at the historical facts.
In every previous Presidential election in my fairly lengthy lifetime, with a single exception, the looser of the race graciously and with humility conceded defeat, and encouraged unity. They all expressed support for the winner within hours, at most a day or two from the time the votes had been counted and reported.
The only exception to that process was the Bush/Gore race in 2000, where the entire electoral college race was decided by a *single* state, and by a margin of less than a thousand votes. Think about that. The entire race came down to about 600 votes total.
In that particular case there were legal questions which were raised before the concession, including questions about "hanging chads". Once that legal process had run it's course through the court system however, Gore was mature enough, gracious enough and humble enough to admit defeat. Gore also called for national unity and reconciliation. Note that this concession happened *long* before the states had officially certified their results, and *long* before those results were presented to the congress.
The problem is that once Trump covered those *legal* avenues, he *still* refused to admit that he lost. He still continued to lie about voter fraud even *after* he lost over 60 court challenges, and even after Bill Barr announced that he found no evidence of wide spread fraud which might have affected the outcome of any single state election, let alone *multiple* states.
Instead of being mature enough and gracious enough and patriotic enough to put his country first, and simply admit defeat, and call for unity as everyone else has done, Trump compounded lies upon lies upon more lies, and he simply ignored all evidence to the contrary. He ignored the will and results of the states. He ignored the rulings of the courts. He ignored the results of the investigation by Bill Barr and he justice department. He ignored the advice of Farah who urged him to do the right thing. He *refused* to stop lying!
Trump let his ego run amok for *months*, lying to his followers over and over and over again about a mythical "stolen" election. *He* instilled all that anger inside of his followers and that mob with his *lies*. That anger was *put there intentionally* by Trump, a man without a conscience who put himself above his country, himself above the constitution, and himself above the courts.
But Trump didn't stop with simply instilling and inciting anger in his followers. He took it to the next level of sedition. Trump used Twitter to actually *summon* the angriest elements of his followers to DC on the day the electoral college votes were presented to a joint session of Congress and to the VP.
They were angry and ready for violence even before they got there. They brought pipe bombs and guns, bats, pipes, mace, bullet proof vests, riot gear, and handcuffs. They erected a noose and gallows outside of the Capitol. They were angry by the time they even got to DC at Trumps invitation, and he fed them even more lies to make them even angrier. He lied by making them believe that they could could somehow change the outcome of the election by being there that day.
His lies got even more ridiculous and more dangerous too. He falsely stated to his angry mob that Mike Pence had the constitutional authority to change the outcome of the votes. That was a lie. In reality, the VP's role in the counting of electoral college votes is ceremonial in nature, and he/she doesn't even get to vote in the matter. Mike Pence had *no* such constitutional authority. That was a *dangerous* lie. Trump threw his own VP under the bus and put his life in danger that day.
Trump and his personal lawyer spent hours whipping the mob into an angry frenzy, with lies upon lies upon lies upon lies about a mythical stolen election. They used violent terms like "trial by combat" and "fight like hell or you won't have a country left", and "take names and kiss ass". These folks were already angry and *prepared* for battle and they wanted trial by combat by the time Trump was done speaking. Some even wore sweatshirts to the rally that said 'MAGA January 6, 2021 Civil War". They knew why they had been summoned, long before they arrived in DC that day, and everything Trump and Giuliani fed them was music to their angry ears.
Trump then told them one last cowardly lie when he said that he would march down to the Capitol with them. Instead, Trump went back to his office to watch the real show begin.
It turned *violent* fast. Mr. Twitter fingers however sat there for *hours* and did absolutely nothing to attempt to communicate with the violent mob that he summoned to DC and sicked upon the Capitol. Hours of violence went by and dead silence from Trump.
When he *finally* did attempt to communicate with his angry mob, he didn't condemn them, or condemn their violence and destruction and looting. Instead he claimed that he "loved' them, and he told them that they were "special". The "law and order" President allowed his own Capitol building to be ransacked and desecrated and he didn't lift a single twitter finger to condemn any of it, the whole day! It wasn't until *the following day* that Trump *finally* condemned the assault on the Capitol and condemned those who participated in it. Why did it take him that long?
All of the events of January 6th are a direct result of the fact that Trump wasn't man enough and mature enough and *humble* enough to simply admit defeat, to put the needs of his nation above himself, and simply *tell the truth* that he lost in free and fair elections. He's still *never* told the truth about that fact. He wasn't even mature enough to show up at the inauguration, but Mike Pence sure did. Contrary to Trumps lies, Pence has more courage than Trump and his bone spurs ever had.
As for the rest of your post, let's look at how it's gone politically for previous Presidents. Politics is a *dirty* business, and it has always been that way. If Trump had any illusions about that, he was a *horrible* student of recent Presidential history.
Are you old enough to remember Kenneth Starr, and the "Whitewater" investigation? When the Republicans won the house during the Clinton administration, they decided to appoint a special prosecutor to investigate a real estate deal that went bad, and money was lost by investors. The only reason anyone cared about *that* particular bad real estate deal was because a "Clinton" had been financially involved. So off Ken Starr goes on his "special prosecutor" mission to investigate the Whitewater matter.
He found *nothing* wrong at Whitewater. But Ken Starr wouldn't stop hounding Clinton, and he wouldn't close the investigation. It dragged *on* and *on* until finally one day Starr heard about blue dress and a sex scandal that had *absolutely nothing* whatsoever to do with 'Whitewater', but it did involve a 'Clinton'. *Finally* Starr caught Bill Clinton in a lie about his sex life, and the GOP impeached Clinton for telling a lie about his sex life under oath. It went nowhere in the Senate of course, but that was the modern day precedent for all future impeachments.
I hate to burst your bubble about Trump being so "mistreated". All modern Presidents have been mistreated, some worse than others. Most of them were smart enough to *not* start wars with the media however, and Trump took things to a whole new level on that front. He brought it on himself by antagonizing the press.
He also said *outrageously* controversial things during the campaign, like claiming to love WIKILEAKS, and asking the Russians, on live TV no less, to "find" Hillary's emails. The GOP changed it's platform too in favor of the Russians and to the detriment of Ukraine. Several of his chosen staff had previous ties to Russia too. He compounded the problem by not condemning the Russians for trying to interfere with our elections, and standing besides Putin and telling the world that he trusted Putin more than he trusted his own CIA.
Again, it's hardly surprising then that the justice department decided to look into his ties with Russia.
Note however that unlike Kenneth Starr, Mueller was a consummate professional. We didn't get a ton of 'leaks' from Mueller's team, like we did with Ken Starr. Mueller only investigated the Russian/Trump issue, and he simply turned over other evidence to other parts of the justice system so that *his* investigation stayed on track and on purpose.
Instead of patiently allowing Mueller to do his job, Trump badmouthed him too, even *before* any decisions had been made, and even before anything was known.
When Mueller closed the case and turned over his report, it turned out that there was not sufficient evidence to charge Trump with collusion with Russians, and the case was closed. End of that story. No impeachment for Trump, but it resulted in a few felony charges for folks related to other matters, so it wasn't (until Trumps pardons) a complete waste of time like Whitewater.
To get himself impeached, Trump didn't just lie about his sexual infidelities, he withheld aid from an adversary of Russia who was in a hot war with Russia (still is) and he tried to get a foreign power to dig up dirt on a child of his likely political nemesis. He incited a violent attack on the Capitol to earn his second impeachment.
Well, it's not like Trump was the only President or Presidential candidate in history to be treated badly by the other party. Remember all that "lock her up" nonsense over Hillary's use of a private email account?
Here's every Trump administration official accused of using personal email for government work including Ivanka Trump and Jared Kushner