Social media has made it possible for the misdeeds of some police officers. The U.S is huge and it's possible for some bad cops in say L.A to beat up a suspect. Some days later another bad cop beats up a suspect in N.Y. When people see the news stories detailing the violence, they make the assumption that police brutality is rampant in the U.S. The fact though is, if people respected police, didn't try to run off when stopped, etc, etc, then quite obviously we'd hear less of these [horror] stories.