No matter what, the most fervent supporters of Trump will not accept that he lost the vote outright - it had to be stolen, cheated away from him. It was voting machines everywhere, dead people, people from out of state, ballot drives, main stream media, social media, etc..
Also, in 2016, no matter what, the most fervent supporters of the left did not accept the result. It was a Russian conspiracy, cyber hacks, social media manipulation, etc..
I mean, is anyone really surprised by all of this? From where I sit, the radicals in the parties will only ever believe that when their side wins it's legitimate, and when the other side "wins" that it's illegitimate for some reason that they will be sure to come up with; it will be sufficiently vague, unprovable, and probably conspiratorial. They will only ever be satisfied with methods and processes when it's to their favor and gain; anything else will be illegitimate. If we were able to peer into an alternate world where the situation and roles today were reversed, you could bet your dollar that the the each side would be doing what their opponent is currently doing.
Moderates and rational people of all stripes should just ignore the noise and unrealistic expectations from partisan radicals.