Are cops out overstepped these days?

In the last few years, several incidents of alleged police brutality have gotten a lot of news coverage. A few instances include the fatal beating of Kelly Thomas, the Eric Garner incident, and the Michael Brown incident. It seems like these sorts of incidents have been getting a lot more press these days. So what do you think? Do you guys think that the police have started overstepping their bounds, or is it something else?