I think the issue is that we see an ever increasing 'militaristic' equipping of our local law enforcement units. There seems to be a trend over the past 20 years or so, to blur the line between the military and local law enforcement. Not just through equipment but also training, tactics and attitude.
The military attitude is much less "innocent until proven guilty" than our "civilian" laws portend.
While i believe that our local law enforcement agencies has just cause to up-gear, up-train and up-tactic due to the increasing capabilities of threats, I also believe that there is a very real 'Orwellian' threat facing the citizenry of the U.S.