Some maps, from the NYT of all places. Again, this shows that blaming this on "conservatives" (or liberals) is a myopic view. The problem is far too widespread for that.
Course liberal gun controllers also have to deal with the whole "Only the Police should have guns" and the proliferation of "military rifles" in states where they banned commoners from having 'em.
I'd like to stress that this gear is symptomatic of a greater problem. That is the abandonment of Peelian Principals.
It's less the gear the police have and more their acting like an occupying army and thinking warrant service has to be framed like a tactical assault.
The problem with this gear is that it's expensive to maintain, is handed out cheaply, and thus can become a big budget drain and threaten to be a white elephant. So there's the temptation to use it. And why not use it? Afterall aren't the police the front line in the War on Terror and the War on Drugs?
One can readily see how problems crop up.