The fourth amendment is about unreasonable searches and seizures. Having armed men stop your car and take all your cash without warrant or cause should be a clear violation but it makes the police and city money. As it is we have LITERAL highway robbery in all but name.
That one is a bit narrow but the court determined that silence can be used against you if you do not claim 5th amendment protections if under questioning by the police. The police do not give Miranda warnings for questioning people, only when arresting people.
I'm not sure why you believe this doesn't happen in other states. Most legal actions end in plea deals not because of established guilt but because a lack of speedy trials. If you have no money for bail then you would wait months for a trial in jail whereas you could get out on probation for many offenses if you just plead guilty, regardless of guilt.
We shouldn't be OK with police killing and beating as much as they do. In proportion our police do it WAY more than any other country with money.
Also there are entire departments that are corrupt to look the other way when it does happen
Rampart scandal - Wikipedia
The point is about prisons and others making money off the labor of the prisoners. That creates perverse incentives to have more prisoners and to compel them to work.
Indeed, and the leaked files show that the Republicans had a targeted campaign to disenfranchise minorities.
The post is about the erosion of constitutional rights, you are not exactly protected from unwarranted search and seizures if the police can just pull you over and take your cash.
You are not given a speedy trial if you have to wait months, potentially years, in jail to prove your innocence.
And not everyone has equal representation if groups are actively colluding to disenfranchise them.