For years I've been skeptical of the efficacy of police tactics and strategy. I'd say that skepticism has evolved to a default of suspicion of any police activity.
I find myself contemplating installation of bars on my doors and windows, security fencing, etc; not for fear of "normal" crime, but of errant police activity. I wish I had some statistics upon which to base that notion. I'm a fairly normal, caucasian, middle-class guy with a wife and two kids, no criminal record; and I am more fearful that I will be harmed by police criminality or ineptitude than by non-police criminals.