Yeah, I think part of the reason people kept quieter about Corbyn was because he had power and was prepared to use it, not that people ought to have spoken up more about his views because having power he ought to have used it.

I do think that his lack of action on allegations of anti-semitism when he had power says something about his priorities or judgement or possibly even his beliefs.

And I do completely agree with you that comparing the two doesn't quite make the case that Badiel seems to think it makes.