I don't know, do they? I'm still waiting for someone to reply with concrete examples of systemic abuse, not this kind of emotive nonsense.
Police abuses against dissidents and disinherited is widespread and well documented if you're not actively trying not to discover it. It's not other people's responsibility to do this work for you especially once you've gone out of your way to frame the very idea as "emotive nonsense."
This sort of rhetoric is absolutely poisonous and supremely counterproductive to any social movement. No cause is too righteous to require participation in the political process. If there is an issue in society that you want corrected, it's on you to persuade others to support your cause. The status quo is innocent until proven guilty, the burden of proof rests on the prsopective reformer. That's how democracy has always worked!
Why even have any constraints on law enforcement if they’re so trustworthy? Just let them do anything to catch criminals and trust they don’t take it too far. There are rules for a reason here, it’s to preserve ideals that society holds as a group.