You also have a high number in the states of returning war veterans that are stream lined into the police force.
So its not wonder the police forces are running more like military than a actual police unit. Factor in PTSD and you have a timebomb waiting to go off.
I've been saying this since 911 I could see it coming from a mile away...good to hear it brought up.
IMO this is why US police forces seem to no longer prefer to deescalate a situation. You don't do that in combat. That is one huge part of the problem...they are no longer soldiers - they're police. Huge difference.