When you don't have a legitimate argument, play the morality card. I was laughing at your silly comment, not the shooting of a teenage girl. Obviously.

"If guns were not so readily available this person wouldn't have had one." So many leaps of logic it's hard to know where to begin. The main point, I think, is that there are hundreds of millions of firearms in the US, and repealing the Second Amendment ensures that law abiding citizens can't defend themselves against people who don't care either way about the Second Amendment. 

Fortunately it's a moot conversation. It'll never be repealed. Utopia is a paradox, join the rest of us in reality would you?