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Hehe, the thing here is that the most people dont randomly shoot others...
I dont want to be shot so i dont shoot if i dont have to. I´m pretty shure most people are like this.
So after the first few violent idots where shot, it would be pretty peacefull I assume.
But there are problems, which brings us to the top of the page... see what I did here xD

I assume

That's a pretty big assumption to base 70 billion peoples' lives on...

there are less than seven billion people alive
your arguement is invalid.

Yeah, thats the thing about not knowing something.
But i´m shure you will enlighten us about the true circumstances.