By definition, it cannot be irrational to have a "fear" of an irrational sociopath, leading a team of incompetents, taking over a government which not a single one of them has a fucking clue how to operate.
Rather, it is the most rational response possible, to be concerned about what sort of damage they could do to a country which hasn't had a truly legitimate government since December 12, 2000 (yes Obama was legally elected, but he refused to reverse any of the unconstitutional things done by the BCE/PNAC fraudministration which preceded him. Which effectively made him the legitimate administrator of an illegitimate government. Cheeto can't even make that claim, given the Commie hacking, the illegal electors, and several other crimes committed - though some of those were by Hillary and her pet Scatterbrained-Lush)