I would certainly hope that cops are not walking around thinking that everyone is out to get them. That leads to a "shoot first" attitude that has led to many civilian injuries and deaths. I think that most cops are pretty level-headed, but the job itself can create the situations where a cop loses that balance and gives in to the fight-or-flight response. And that's a bad thing to have happen when you have a gun and a badge.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould