Yes, WE know he's buffoon who has NO CLUE about the words he uses, but the rest of the world DOESN'T.
Exy, I wouldn't assume that the rest of the world doesn't know, they're not nearly as clueless as you seem to think.
But, you do make a good point. Unless he learns to stop posting every idiotic thought that comes into his tiny brain, he's asking for trouble, because sadly no one ever knows if he just posted the wrong word, if he's just having a hissy fit, or if he's serious. The entire world knows what a moron he is (well, with the exception of those that voted for him), but the problem with a moron is that he's a moron. You don't give a moron the keys to destroy the world. Hell, you don't even give a moron the keys to your car. It's just not a good idea.
So the real problem isn't that the rest of the world doesn't know what a buffoon he is, it's that the rest of the world knows exactly what a buffoon he is.
So yes, someone needs to either shut him up, or censor everything he says. If his words start a war, it won't be because other countries took him seriously, it will be because no one, not even any of you, knows what he'll do, or if he'll actually do what he says. That's a very very dangerous thing for the US.