How about we blame the republicans for not doing a fucking thing about gun regulation.
Guns have been more regulated over the years. The system is no where near perfect, but you're and idiot for thinking gun regulation will do anything. There are guns being sold in secret everyday. If a terrorist wanted a gun, it wouldn't be terribly hard to get even if super regulated. People are also killed with rocks, knives, bats, etc. So why don't we regulate those too?