He's nasty and astute
He hangs around with horrible bigots who support eugenics, like Steve Bannon.
He cannot manage a day without having to publicly apologise for some dreadful remark he made.
He is even more likely to carry on heaping austerity on the sick and disabled than any other Tory leader.
When he was mayor he closed 10 fire stations in London.
He's dangerous and he doesn't give a fuck about anyone. I can't think of a worse proposition for PM.