When he commits the crime

And all of these laws and restrictions and hoops to jump through are to prove that someone actually committed a crime. So we are back to the original problem, you don't see an issue if innocent people get hurt as long as more criminals suffer along the way.

japanese police

No idea, don't live in Japan. We are talking about an issue bigger than one country, with theirs as just an example of one of the abuses. Considering you just brought up OJ in the last sentence, you know this and are just trying to restrict it down to win an argument.

You beat criminals who mug/rape/rob/kill/extort people

Your trauma is showing when you list what happened to you first before raping and killing, and completely skip assault to make sure that you list it twice (all muggings are robberies, its a specific type of robbing).

And we aren't settling shit that way. If cops get to beat anyone they suspect are criminals, we get to beat them if it turns out we aren't.

you think the cops were the ones who initiated the hunt for j6

All cops are government employees, which means their use and deployment is entirely and always political. Including what constitutes breaking the law and what makes you a criminal. Which is one of the problems with your entire idea. They are not weapons that exist to catch and punish criminals in a morally neutral, bipartisan sense. They are flawed men acting as the arm of a system you yourself have just said is being used in a horrible, evil fashion.

So why should we give them more freedom to charge and brutalize us? They do not exist in a vacuum, so are agreeing with all those perversities of justice being acceptable by saying they should have more power.