Ok listen mate,
Do you think this knobhead, Stephen Paddock just woke up yesterday, looked in his gun cabinet and decided today was the day he would check into the Mandalay bay and kill multiple people at a concert?
These acts are planned in advance. Or are you saying he just happened to take multiple rifles to a hotel for no reason, and that it was just a coincidence a concert was taking place yards away.
With it planned in advance, I would imagine obtaining an illegal firearm would be part of the planning ( if firearms were banned).
Again, banning firearms won't stop the crazed nutcase who wants to do harm.