Taking police department reform efforts as an example, it would still be quite difficult for an outsider to fix things. There's just too much political baggage.
There needs to be additional political pressure from another source. If states, who are responsible for protecting the rights of its citizens, were to respond vigorously to each and every incident of abuse, it might provide the necessary pressure. We as state citizens, should in turn pressure state officials to do this every time, like clockwork.
That would be nice, but unfortunately state and local governments have been quite effectively coopted by the chase for the almighty "federal" dollar, and willingly dance to the federal tune.
Es ist verboten, Staat Sekuritat zu kritisieron!