> We are already very aware that the police overreact and make plenty of mistakes
This is the deeper problem. See BLM, and then the backlash against that to create a much less accountable federal paramilitary/carabinieri force, ICE, resulting in the Minnesota conflict and several people getting killed.
And what lies underneath all that? Dirty Harry and a whole stack of subsequent propaganda. There's a very powerful story that the world is full of criminals and any form of police accountability (such as double checking information before acting, or taking a safety focused approach to stops which may include not doing them) is getting in the way of "fighting crime".
HN is firmly against Flock, but there are lots of people, Republicans and Democrats, who are going around demanding more surveillance to fight crime.
(The UK "ring of steel" and high presence of surveillance cameras and ANPR do not seem to have nearly this much level of problems. Here the controversy over stops is mostly good old manual racial discrimination for "driving while black")
The being tough on crime narrative ignores that police can act like criminals, have biases, enforce societal stereotypes and class systems, be incompetent or just make mistakes like any other human. Having a gun and a badge doesn't prevent any of that, thus the need for accountability. But voters also have to hold their representatives accountable for making sure police departments and justice systems do this.