Since you brought him up: Stalin was also motivated by a truckload of paranoia, though, right? Hard to make rational decisions about who is dissenting if you think they’re all out to get you. The flimsiest accusations related by the least reliable people could be enough.
A classic feature of authoritarian governments: when their dumb plans fail, it's because of enemies of the state. Bonus points when the enemies of the state are the ones that warned of the negative effects that would happen (obviously they must have been saboteurs)
He executed and imprisoned a bunch of his best aircraft designers. Look what he did to Andrei Tupolev and his design bureau; they designed a whole aircraft in the Gulag: https://vvsairwar.com/2016/10/20/aviation-design-in-the-gula...