Enough is enough
"What the New York Police Department found out, through empirical experience and better organization, was that making crime even a little bit harder made it much, much rarer. This is undeniably true of property crime, and common sense and evidence tells you that this is also true even of crimes committed by crazy people (to use the plain English the subject deserves). Those who hold themselves together enough to be capable of killing anyone are subject to the same rules of opportunity as sane people. Even madmen need opportunities to display their madness, and behave in different ways depending on the possibilities at hand. Demand an extraordinary degree of determination and organization from someone intent on committing a violent act, and the odds that the violent act will take place are radically reduced, in many cases to zero."
No less true today then when it was written in 2012
http://www.newyorker.com/news/daily-...ut-gun-control