Seriously, were the last dozen Presidents the sanest people we could find, to have access to that nuclear football? That's a scary thought.
Fortunately, other people are also involved... and the U.S. military has sane people running the show.
Like the ones that invaded Iraq and AfPak ?
I would like to point out here that the beauty of our society is that the armed forces have an iron tradition of following tho orders of their civilian leadership.
It was not for the sane people in the military to decide whether to invade or not, it was their decision to follow orders or retire.
Therefore, saying that because the military did the actual invading means that their leaders are not sane enough to stop a use of the nuclear football is wrong.
Most military leaders advised against invading Irag (except for the ones who were appointed by Bush/Cheney or who would specifically profit monetarily from such an invasion).
See, there are sane people in the military. In civilian leadership, not so much.