Well, people voted for it. Cameron thought he would win a confidence vote with Brexit but he lost! The he had to do what people asked him for but it went against what he believed so he quit. His obvious successors were the clowns who campaigned for it (Boris Johnson and co.) but they were just opportunists and not dumb enough to go for it so they put May! I don't know why she thought it would politically help her to be the Prime Minister at that historically/hysterically moment but she accepted. She got there with the explicit task of fulfill citicizens wish but now it seems she is just noticing the political damage it would do to her! It's crazy!