Not to sound ignorant

[Monty92]

In response to a nuclear threat to US territory, he chose to escalate the situation to the brink of nuclear war. That he may have been right to do so and the fact that we got back from that brink don't alter that fact.
My point is that nobody calls him mad for those actions.

People aren't calling Trump mad for his actions on NK so far. They're expressing concern that if he is indeed mad, or more likely of a psychologically imbalanced personality type, then we have reason to fear that the racheting up of the rhetoric that we've heard from him is a harbinger of his inclinations to actually put his threats into practice, even if doing so was a terrible idea.

Of course, his willingness to put his threats into practice must be real, otherwise they are meaningless as a deterrent. But that benefit is predicated on the assumption that doing so would be the right and neccesary decision.