Interesting take, and exactly my thoughts. This is the precise impression that the whole situation with Trump gives; that you can't take him or his word seriously. And that is very dangerous IMO
If you behave too much like a child in the eyes of those you have to deal with, they will have to assume you are a child. Remember, literally the eyes of the world are affixed on this at the moment. The POTUS is always a looked upon figure, the one P that everyone around the world knows his (or her) name. Non-Europeans, name 10 other currently in office presidents excluding Canada's and Mexico's, for instance.
So now when we have a child in the room, and that damn kid happens to posses nukes, all bets are off. Maybe this is exactly what the people wanted?
Again, don't shoot the messenger. Opinion piece on the other favorite fake news outlet (MSNBC are partisan bad, and are basically becoming coporate-left-wing FOX, not kidding there, but anyway here it is)
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https://www.youtube.com/watch?v=fM8iWOOLlls