I really disliked Corbyn but he won the right to lead in 2017 and I think it was fair for the Labour party to line up behind him and see where it would go. (To disaster was the answer, but such is life - I actually wonder whether Johnson would have won against a more mainstream Labour leader in 2019, which was about rejection of Corbyn more than approval of Johnson).

Politicians are going to politician, but Johnson is the most appalling chancer ever to get the PM role. He doesn't care about governing, only power for its own sake to feed his ego. I'd even take May back or approve of Sunak replacing him, he's that bad.