Only a few incidents that were more than "most cops are azzholes" should be proof enough that there is less police corruption than ever before. Anytime the police engage in any sort of use of force there are a dozen people with camera phones hoping to catch that pig brutalizing that nice mugger, plus the car cams and now the body cams, and all you can come up with is a few examples out of the tens of thousands of contacts made each day? If this is your case that cops are getting worse you have a really weak case.