>>11145018He uses his intellect purely as a way to extract money from others.
He's using the eons old scam - tell people end of the world is inevitable unless a miracle happens (friendly ai). (((Coincidentally))), you can make the miracle more likely if you give money to MIRI ~~priests~~ researchers, especially top ~~priest~~ researcher Yudkowsky.
On the whole, he's a harmless scammer, but it's not surprising that a scammer irks some people.