Putin and Xi are predictable. We don’t have to like them or approve of them but we can plan for them.
Trump is insane and impossible to plan for. You never know when he’ll randomly commit an act of war by assassinating a foreign leader, back out of important deals because of a mood swing, get thousand of allies slaughtered or simply nose dive his own economy while getting hundreds of thousands of Americans killed.
Trump constantly makes it clear he doesn’t respect anythin, not agreements, not expertise, not logic, law, rights or anything else.
irrational unpredictability is one of the worst possibly qualities a leader can have. And for Trump its his defining quality alongside a complete lack of morals and ethics.