I doubt that Mr. Trump is dumb
I suspect he is a uni-directional one dimensional thinker ... examples
taking Russia as an ally ... does he realize Russia is allied with Iran and Syria? How does it work that he could ally with one and not the others? Israel is an enemy of Iran. If Mr Trump allows the Israelis to bomb Iran does that affect his alliance with Russia? If Mr Trump moves the US embassy to Jerusalem does he realize all our ME allies may drop any support against ISIS? Even worse they may acquire nuclear weapons.
Now a real thinker, someone with real intelligence would have figured this out. Someone with limited capabilities would have bumped the china cabinet and will end up buying the whole shop. Which one is Mr Trump?