Now you want a perfect world where its impossible for a terrorist to use a nuke? Well, that's what we are fighting the WOT for. You are correct there is less support for Israel today. you are not correct that the US wouldn't defend Israel, and of course Israel would defend itself. AND you are changing the subject now to an untraceable terror attack, which was NOT the original point.
No, the original point was how much the USA would defend Israel in the event of an attack. I think not so much. I hope I'm wrong.