That's a fine analogy...except for all the murders committed by family members in houses. It happens sufficiently frequently that there's the well known (and po

That's a fine analogy...except for all the murders committed by family members in houses. It happens sufficiently frequently that there's the well known (and possibly apocryphal) idea that police always treat a spouse as a primary suspect. So, while I'm willing to bet my wife isn't murderous (I don't -know-, but I'll assume so)...do I really want to assume a -stranger- isn't, knowing that there are murderous people out there, and that if I'm wrong my entire family will die? I mean, you say "someone who is sane will never seriously consider killing someone else" - great, how possible is it for an insane person to end up heading a nuclear armed country? I mean, I don't think I want to trust 192 (or whatever our country count is at) random strangers to all be sane.