Today's Left endlessly preaches the evils of "gun violence." It is a message increasingly echoed from the nation's pulpits, presented as common-sense decency and virtue. Calls for "radical non-violence" are routinely endowed with the imprimatur of religious doctrine. But what if such teachings were misguided, even damaging? What if the potential of a citizenry to exercise force against violent criminals and tyrannical governments is not...