The answer is simply: Darren Wilson.
A single statistic utterly gives the lie to the idea that change is impossible in our country: Darren Wilson fired more shots into Michael Brown than the entire police in England and Wales fired at people in 2013.
For the world’s last remaining superpower America is still far too violent. It retains the death penalty and its culture of arms has gone too far. Combine these elements with institutional racism and we get Darren Wilson, George Zimmerman and countless others throughout modern history.