"I know America isn't interested in nuclear warfare. But, what if that changed? What if you elected a guy that not only went to war, but, went to nuclear war? ' Tarlam!
What's your point based "in reality" man.
We don't live in a movie script Tarlam!.
We live "in reality"Tarlam!, and such a man as President (as you suggest could exist) would be impeached or otherwise forced from his office... as President of the United States of America.
To even consider such a possibility of a man being the Head of State of the most important Nation in the World; and linking that to a suggestion of him being insane...is hardly realistic therefore moot.