Ferguson happens a few times every month. More often in the summer when tempers are hot and crowds of bored men and women fill the streets looking for something to do. Teenagers ransack stores. Small cities stretch their budgets in a bad economy to put as many cops as they can on the street. And then somewhere between the open fire hydrants, the stores that do most of their business in EBT cards and lottery tickets, the check cashing places and furniture rental outlets, something happens. And it happens a lot more often than you think. A crowd gathers. Fists...