Statiscally, African-Americans commit more crimes per capita than white Americans. If we were to outlaw being African-American, by putting them all in gas chambers for instance, then we would see much lower crime rates.

But we can't do that because that would infringe on the liberty of human beings, just like outlawing gambling, drugs, or guns does. It's a slippery slope...

"Any society that would give up a little liberty to gain a little security will deserve neither and lose both."