What has happened over the last few nights in major cities of the United States is unacceptable. It has gotten worse because of federal and state passivity. Law enforcement is a vital response to any riotous uprising. Indeed, I believe the failure to enforce the laws without apology from the start of the upheaval last week has fueled its ferocity. It would be naïve to claim that much of the violence, which is being incited and coordinated by radical groups, might not have happened anyway — these groups are always on a hair-trigger, pouncing on any opportunity to make mayhem....