Flock in absence of police is not that bad except for the whole "now we have no police" problem. Having police in the absence of Flock is totally fine, we've done it since forever.
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Welp, sucks to get the shit beaten out of you, better luck next time.
If you have no cops, the cameras don't mean anything. It is now de facto legal for big people to beat up smaller people. Your cameras mean nothing. You can now film yourself getting beaten up every single day forever, and congrats, there's nothing to be done about it because there's no apparatus of the state to physically protect you.
If you understood my comment to mean "police are perfect", then I must've been unclear. That's not my position and not a position I'm interested in defending or discussing.