Because he can't stand being a LOSER.
Because he can't stand losing all power
Because he can't stand NOT being in control
Because he can't stand disloyalty
Because he can't stand those who despise him
Because he can't stand those who defy him
Because he is a tantrum hissyfitty spoiled brat
Because that is all he has going for him
Hate Fear Envy Greed Insanity drive him
He has been mocked and ridiculed his entire life. He has desperately wanted to be accepted by the elite who will have nothing to do with him.
All of those becauses
Probably more