Heading for another era of McCarthy-ism. This time from the left instead of the right.
Why on earth would we not try to detect and remove these people from law enforcement agencies?
As for law enforcement involvement in the terrorist attack on the capitol, there are plenty of videos. Law enforcement agencies around the country have also disclosed that some of their officers were involved, which seems like an odd thing to fabricate.
So yes. We know that.
There's a pretty big gulf between a relatively abstract set of political and economic opinions, and an ideology that views some groups of people as sub-human and inherently criminal, and specifically seeks to disenfranchise them. One can quite reasonably make the case that individuals who hold opinions along those lines are temperamentally incapable of protecting and serving their community. Their whole community.
The Chicago Public Library had a gallery documenting victims of torture by the Chicago Police Department. Plenty of photographs, making it quite clear that it was almost exclusively a thing that White cops did to Black and Latinx citizens. It's hard to see how we as a society can hope to eliminate state-committed atrocities like that if we're not even willing to weed the ideology that produces them out of the paramilitary wings of our local governments.
Speaking on a more macro scale, the movement that produced that protest and this insurrection is so transparently rooted in racism, with roots going back at least as far as the Southern Strategy, that we're now to the point that trying to apologize for them is, at the absolute best, an act of petty denialism.