I don't think he's the dumbest. I agree wholeheartedly with the second part of your statement--he knows exactly what he is doing, and that is to set off a war in the Middle East--one that probably will involve the first combat use of nuclear weapons since August 9th of 1945. The resulting chaos that this wil set off in the world will eventually lead to the emasculated militaries of several NATO nations in combat, on their own soil, for the first time since World War II. Also, the resulting chaos will lead to . . . To Hell with it--I'm not going there.
We're in a bad way with this. 
I don't disagree with any of this, but have you stopped to consider WHY he's doing this? I think that part is even scarier:
he did it because he is desperate to be liked by people who hate us. Every government of any size in the entire world has a large dossier on this fool, and they've asked their own psychologists to profile him. I can guarantee you that each of them has come to the same conclusion: that 0bama is so insecure and so emotionally fragile that he will seek the approval of those who intimidate or threaten him rather than confront them. It isn't that he would rather be loved than feared. No, it's worse.
He would rather be accepted than respected. Barack 0bama has no grand design for the United States, and no real opinions about it one way or the other. This is, literally, simply his job. It just happens to involve the well-being and livelihoods of 330 million people. All of this - the entire Administration - is about exactly one thing, and that is servicing his flaccid self-worth by engaging people who should not be engaged. This Iran deal is not only a disaster for the Middle East, but it will ultimately not even answer the most prominent doubt swimming around in that ill man's mind:
"Do they LIKE me?".
And this is what we have to look forward to, what with the systems and institutions we've set up for our young people. Take a fatherless child and attempt to replace that influence with unearned praise and platitudes, and shower that child with dubious honors and meaningless distinction, and then put that special snowflake in front of millions of idiots who feel guilty for being raised under better circumstances, and you get 2008 and 2012. Couple that with the utter inability and complete unwillingness for a liberal to ever brook the thought that they were wrong, and the cycle will repeat itself over and over.
Meanwhile, as we wait for the next Indigo child to graduate
summa cum blackkid from Harvard, we get to think about what that feckless, self-hating lunatic will do when the Joint Chiefs tell him Tel Aviv and Los Angeles and Madrid and Rome are gone, given that his first worry is
BEING LIKED. We are ****ed.