If we send you to space you'll have to pass a fitness test.. Because we aren't stupid?
But sure, anyone in the middle of a psychotic break who can't tell fact from fiction should be fine for the entirety of national interests. Shoot down another plane for the old Gipper!
The real problem societies face is reaching a good fitness test for decision makers.
That includes voters - discriminating, promoting, managing (etc.) the best electorate. And we had more focus and success in the past (abbeys, Venice etc.) than in the present, where the matter of electoral systems is kept like a theoretical branch of political science. And in running reality, people get Gerrymandering - an _opposite_ effort.
Mr Trump was supposed to be picked up by a military tribunal and probably executed. Whether that tribunal system is overreaching would have been an excellent discussion, after the execution.