I see it both ways.
Clearly there are police that are overly aggressive. And you can see this watching Cops. By the same token, I don't know that my second grade English teacher is the guy I want to show up if my life is in danger. There are certain personality types attracted to all types of work. I guess the Gung-Ho type is one of the types attracted to police work.
A few years back in Hershey PA there was an officer who was run over by a driver who did not want to stop for the police or flatten his tires on the spikes the officer had just thrown out. So the guy just swerved his truck and ran over the officer, problem solved. The officer will suffer for the rest of his life. No film loops, no Connie Chung, just some disability pay and a write up in the Patriot News.
I don't think most people would (A) want a driver like this running over their (child, spouse, lover) being on the streets. Or (B) would for $38,000 a year want to deal with people just like this day in and day out. Or (C) would be able to do it without occasionally lighting someone up with the billy club.
Not saying it is right, but I sure can empathize.