Um...
Er...
Well...
So...
A. You'll buy a gun and wave it in people's faces.
B. You... Won't buy a gun because... You're not a psychopath? (As though it took being a psychopath to wish grievous harm on someone.)
Also, fyi, if you're being shot at first, you'll probably be dead before you can reach for your firearm. So saying you'll only use the firearm in self defense and not preemptively is going to get you instantly killed in about 95% of situations. Especially if there's a gang of them, and one of you.
Plus, a gun massacre will land your ass in prison, for life, pretty much guaranteed... Possible even death row seating. Just saying.