What makes you think that Bush is responsible for setting U.S. policy on nuclear weapons? It is my understanding that these sorts of policy issues are recommended to the President by members of the military establishment, so the fault mostly lies with his military policy advisers. I always thought that the U.S. was constantly building nuclear weapons and improving upon them but if it's true that we haven't built one since 1990 I think that puts us at a disadvantage. It doesn't look like Russia is taking the issue of nuclear weapons too lightly, neither should we. The potential threat is always there.