What law would have stopped this guy?

I have previously posted this quote attributed to Paine, and it's worthwhile to look at part of it again.

"I am thus far a Quaker, that I would gladly agree with all the world to lay aside the use of arms, and settle matters by negotiation: but unless the whole will, the matter ends, and I take up my musket and thank heaven he has put it in my power."

and

"Kill a few and take the whole. thus the peaceable part of mankind will be continually over-run by the vile and abandoned. while they neglect the means of self defence."

Even Paul the Apostle tells us in Romans 12:18, "If possible, so far as it depends on you, be at peace with all men." Of course, the problem remains the other guy.

In his post titled "What law would have stopped this guy?", Rob has a good example of this over on Sharp as a Marble. Why don't people get this? The only answer is that they don't want to get it.