If we were brought to trial for the crimes we have committed against ourselves, few would escape the gallows.
The whole idea of a nuclear system is to have a deterrent where we decide if we're going to use it.
As for the stage fright, it never goes away. When I'm waiting in the wings to go on, it's agony every single time but I stay focused and I know that once I'm on stage it'll be fine; I'll be in my happy little bubble.