I think it is more than the use of force that has people concerned about the percieved growing police state.
When the laws are written as such that anyone with a knowledge of english can tell that they are unconstitutional, yet the courts uphold them, that is scary.
When simply being a gun owner in some states is enough to get you pulled out of your car ala felony stop style, people are afraid.
When police refuse to move move from private property when asked (whether or not said property owner knows they are police), that is just wrong.
It's more of an ever increasing THEM and US attitude between the police and citizens.
The motor vehicle code is written so that you can be pulled over virtually any time you are in your car at the whim of the police. That's why we have driving while black and white boy in the hood stops.
The patriot act makes terrorists out of just about anyone and everyone, all you need to do is creatively apply the law.
The one thing in common with all of this is that the police are the ones enforcing the bad laws, yet time and again(to me at least) it would seem they are above the law except for capital crimes. (the state cops in Illinois with M-16's sticks out in my mind).
I think that if we could go back to only having laws against actions that actually and tangibly infringed on others(saying drugs destroys familys doesn't cut it, prostitution, nope,and lot's of other laws) all the while holding ALL members of the government to the same standards as the citizens, well then maybe we could heal this rift.
Or not.