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You're projecting your own views onto other people without any evidence. In their letters they make it clear that they do now feel his behaviour has become unacceptable, and that's why he's become an electoral liability. They're years away from an election so your argument that it's all about electoral liability lacks explanatory power (why now) and boils down to "politicians innit", which isn't really an argument at all.

If you're a columnist or random commentator, fine, argue whatever you like. It's kind of absurd that you teach politics though. Surely such people are supposed to work hard to be as neutral as possible. I don't believe for one second you're politically neutral on this topic.