The Lack of Safeguards at the Top of the Chain of Command

I was in an underground launch control center in Montana and my job was to carry out a launch checklist that took about one minute. Our job was to wait for the actual order to fire, but of course that order never came or we wouldn't be here right now having this conversation probably. It's a system that gives too much authority to a president who may be behaving irrationally. So if we wanted as a country to give the president less power in all of this, how would we actually do that?