Thing is, when Donald wavers in his love for Vlad, Vlad can reel him back in. It's what he does. Vlad might be a murderous psychopath, but he's a clever murderous psychopath who is very skilled at understanding and manipulating people.
Donald and Elon are both just fuckwits. Limited grasp of how other people function, limited repertoire of tricks.
Sure the tricks can be effective for a while, but...