"lots of instances" meaning what? Of all the police/public interactions daily, what percentage do you think meet you criteria above? 50% 10% 2% ? I'm betting that fairly small amount is correct. Since the predominance of camera phones and social media, those incidents get sensationalized to further a groups agenda. I agree the number of these incidents SHOULD be zero... but we don't need to wax dramatic for the sake of argument.
Nothing "dramatic" at all. The link points up the facts of the matter. There are many, daily, instances of bad actors in various areas of misconduct and outright criminality. Doesn't mean all of them are guilty, but it's far from uncommon.