Rochard... if our society ever allows the govt. to forcibly incarcerate everyone who "acts crazy"...you, me, and 90% of the people would be detained. lol
People like Jeffrey Dahmer didn't "slip through the cracks". He never did anything to "slip through". He was a smart guy and normal in every way...except he secretly wanted to kill and eat young gay guys.
WTF are we supposed to do...read people's minds? We can't. And we can't let the govt. start hauling people off because they MIGHT do something crazy.
That sounds like the Nazi's or The Soviet Union Secret Police.
As far as numbers of people killed and time it took to kill them...what the fuck difference does that make in the discussion? Dead is dead.
And if you INSIST on that kind of wrong-headed reasoning...then realize this: Timothy McVeigh killed 19 children under the age of SIX YEAR OLD in Oklahoma City in about a split second. He did NOT use a gun.
http://en.wikipedia.org/wiki/Oklahoma_City_bombing