So the police should be able to Judge Dredd suspects because they're assholes? And that's what they are, even if the cop has 100% certainty that the suspect committed the crime. The criminal justice system is more than people that eat doughnuts and have guns.
"Are Ferguson police really worried about protesters flying attack drones over the city? Or is this to prevent news choppers from recording their behavior? "
Perhaps some journalism might dig something up? Cyrus Farivar of Ars is reporting that the police said that their helicopter was fired at (but not struck) on Sunday night and they're worried a pilot might be hit.