How did social Darwinism impact American culture beyond economic growth?

So you know how they had that whole Ferguson riot and all of that, well its kinda like this, it was always there but because the public saw the negative it made an uproar and no one really knew the truth. he was jay walking, the cop that stopped him just had a call to were he had to perform CPR on a baby which didn't make it through and he was verbally aggressive, but because of them looking from the outside it looked worse than it really was.