Nuclear weapons - The Power of choice

I know that each country has the right to defend themselves, but i believe that the Nuclear choice is the worst choice of defense. A nuclear weapon has such an destructive power that if a nuclear war goes off then nobody will win. So each money (dollar, euro, pound, etc...) is a waste, because, in the end, it will not be used. It is a choice that each country has, spend their efforts in nuclear guns or spend efforts in developing themselves...