As many times as the world has come close to nuclear war and mutually assured destruction since the end of WW2, it's actually one of the most reassuring things about humanity that people refused orders to fire missiles every time.

I'm always reminded of "Talking to god..."[1] when I read about these close calls with nuclear weapons. The most important paragraph in the entire short story is the following: "The only ones who reach level two are those who learn to accept and to live with their most dangerous knowledge. Each and every individual in such a species must eventually become capable of destroying their entire species at any time. Yet they must learn to control themselves to the degree that they can survive even such deadly insight. And frankly, they’re the only ones we really want to see leaving their solar systems. Species that haven’t achieved that maturity could not be allowed to infect the rest of the universe, but fortunately that has never required my intervention. The knowledge always does the trick".

1: http://www.fullmoon.nu/articles/art.php?id=tal