Incredibly inflated ego and self-image combined with poor emotional maturity and self-control after a life of entitlement. He said it to piss people off and then came back to eat shit, but unfortunately is also so rich he can throw his money away and have it barely matter.
And? I seem to recall that he fantasized about doing it loudly enough and in enough detail, that he was legally obligated to follow through to avoid being charged with securities fraud. The reason he wanted to do it was to take a communications medium away from the liberals and give it to the Nazis.
This is marvel-brained fantasy. The guy played games and ended up with a business he doesn't understand and never should have been in charge of. He's not a super-villain, he's an ordinary villain, dumbass nepotism case.
To see him explain it on Xitter or with a cartoon meme or whatever, he was in the "center", and the radical left was so extreme that they brought the Overton window to the left and ruined his day, and were super mean to him, too, I guess. In other words, look at what you made him do, all normal Americans!
Or something. I guess the super-mean liberals also stole his hair, too.