Yes but now they don't have legal immunity from American citizens who both exercise their second amendment rights and willing to take proportional actions to defend themselves against individuals threatening their lives.

In this situation there would be more armed citizens than disgruntled ex-cops so the problem should take care of itself in short order.

The issue isn't that the police are radicalized and disgruntled. It's that they have the budgetary and legal resources to operate with impunity. Take that away and they're just a gang. Other gangs will eat them for lunch.