This comment of Rahm's, "...focuses its messaging on the most dangerous kinds of guns and high-capacity ammunition magazines..." Is just dumb.
The most dangerous kinds of guns are the ones pointed at you with a bad guy behind them. Doesn't matter the caliber, rifle vs. pistol, or the magazine capacity. Duh. And since you can't count on the cops to be there until after the fact, the only way to counteract that danger is to make the bad guys afraid you might have a gun and, in fact, be a better shot than they are. That's the biggest deterrent to violence.
Criminals specifically choose the weakest and most vulnerable targets because there's less chance the criminal may be harmed.