You can't let nukes constrain you. It's like somebody pointing a gun at and saying "eat this horrible snail, or I'll shoot you", but there's the possibility th

You can't let nukes constrain you. It's like somebody pointing a gun at and saying "eat this horrible snail, or I'll shoot you", but there's the possibility that if you eat the snail, he'll shoot you anyway and then you'll die having eaten the snail. Therefore, as long as you have a second strike capability threats are irrelevant. Everybody who has a reasonable number of nukes can erase himself and his enemy. That is his business and he can do so independently of what we choose to do. Consequently it's something we can't care about.