Correct.
Just ask Rodney King.
Your comparison only makes sense in the most general terms. That is: out-of-control law enforcement leads to bad consequences. Yes, I agree.
But did Rodney King get shot and killed ? No, he didn't.
Of course that does not excuse what those L.A. cops did, but their behavior - as barbaric and cowardly as it was - doesn't compare with an undisciplined, poorly-trained, rent-a-cop reaching into the wrong holster, drawing what he
thinks is his taser, aiming, and from a standing position over a prostrate suspect, pulling the trigger on his sidearm. Sorry, but the likelihood of that happening with real cops is very low.
And when I say "real cops", I mean officers serving on city, county, or state police departments who have been carefully screened and properly trained. I know that no system is perfect and that some nut-ball/socio-paths will slip through. Also - there are those officers who start out fine but go nuts after too many years on the street. It is an unbelievably stressful job that requires heroic performances - large and small - every fucking day. How the majority of these men and women get through their workday is amazing.
Over the years, at my workplace, my co-workers and I have depended upon both "real" cops and "pretend" cops for our security.
Believe me when I say that the difference between a real cop and a pretend cop is the difference between lightning and a lightning bug (to paraphrase Mark Twain for the first time on this board ?)