The Las Vegas massacre reminds us again that semi-automatic and automatic firearms are capable of killing scores of people before outside intervention can stop the slaughter. Because we cannot identify mass killers in advance, we must deprive them of their weapons of choice: automatic and semi-automatic firearms.
(The difference is the former weapon will keep firing rounds until the magazine is empty, so long as the trigger is depressed; the latter will fire one round each time the trigger is pulled. Both types of guns automatically inject a new round into the chamber each time they are fired: i.