The idea that cops respond with reasonable force in a rational manner is a fantasy. They are not some innocent victims of misunderstanding, they regularly fight back with as much force as they are allowed to employ, and if noone's watching a whole lot more. It's part of their dichotomous mentality. There is tons of evidence for the idea that cops regularly appoint themselves judge, jury and occasionally even executioner. Having the right information means nothing if your entire mindset is bent around the idea that you're there to mete out punishment to the deserving and all you're doing is waiting for someone to stick out their neck to be made an example of.