Fair enough.
I'm not going to lie and claim to have read Reeves' book, but given it's a history of women in Parliament, it would be odd if she didn't find something to praise. As I've said, I've not read it so I don't know if she left out all the bad stuff. But I'd expect a biography to cover the good and the bad.
Plus, I guess it comes down to how many degrees of separation counts as zero tolerance. Jeremy Corbyn said that he was "really pleased" when the Astor statue was erected. I wouldn't say that's enough smoke to warrant expulsion, but zero tolerance is zero tolerance.
McNicol I expect can have few complaints if he leaves the party at the end of the investigation if what seems pretty clear to be true, is true.