I've seen lots of LEOs do that, particularly those that patrol a regular, "beat." When I was really young, in elementary school, EVERYBODY knew "Joe the Cop," the policeman who patrolled our neighborhood. He knew most of the kids and their parents, and everyone knew him. He ALWAYS said, "hi," to everyone. A great guy and someone in whom the community felt comfortable reposing their trust.

More recently, my experience living in LA, SF and Orange County is that, when I encounter a LEO on foot, e.g. waiting for takeout in a restaurant or buying coffee in a 7-11, far more often than not, I'll get a friendly nod and/or a, "hello," which I'm always happy to reciprocate. I think most LEOs realize that, without the support of the community, their job would be a lot more difficult and, further, I think that, at least these days, most LEOs become LEOs because it's an opportunity to serve their communities.

Next time you see a cop, trying saying, "Hi." I think you'll be pleasantly surprised by the response you get.