Murdered Over Dog Crap? - The Daily Beast:
When gun proponents talk about "defensive gun use," they invite us to imagine confrontations where one party is wholly blameless and the other party is murderously aggressive. Gayle Trotter conjured up just such a scenario in her imaginative testimony to Congress: mother alone at home with her babies; three or four or five bad men break into the house; what can she do other than mow them down with her AR-15? In real life, however, defensive gun use typically originates in confrontations to which both parties contributed - and in which the difference between aggressor and self-defender depends largely on the story told by the party who happens to survive.
Unless you run a home meth lab, you are exceedingly unlikely to face a home invasion by armed intruders. In order to defend against wildly remote contingencies, Americans are instead arming themselves to turn disputes over dog crap into lethal duels.