"the Las Vegas shooter and the Church-shooter in Charleston bought their guns legally?"

They very well could in a private sale anyway as this article confirms. Since they can get this in a black market and anyone with serious mental issues can as well, why not just legalize it all and make it a wild west again? Let's remove speeding laws and allow everyone drive to 100 or as far as their odometer, since a few will keep breaking the law anyway. The law can't stop it from happening. That's the argument some make.

Very insightful reading this thread all the same.