Forgive me, but when I see a group with immense power and I know what power ultimately does (corrupts), I will ALWAYS be vigilant and hold that group to a higher standard.
That being said, I look at this situation and see that the police officer in this case probably wasn't abusing his power and was probably acting within the law to stop someone who wasn't.
The problem is the presumption that any exercise of authority is automatically corrupt.
The Eric Garner threads exposed people on this site who really believe that you should be allowed to resist arrest if you want to, and that police officers have no authority to make you comply.
That's petulance and childishness, not skepticism and analysis.