I think the derail thread is in fact a clear indication of why so many MRAs have hopped on the TRA agenda.
If you refuse to recognise that men as a sex class oppress women as a sex class then of course men are blameless and somehow women (who all just happen to be the same sex) are more likely to be lower paid, more likely in a heterosexual relationship to be the one who suffers domestic violence, more likely to do the child care, etc., etc., etc..
I dont think we should have to list the ways in which women are discriminated against (and worse) but ask why men, who have in common their sex, treat women so badly.
To expect women to defend standing up against sex discrimination, is as bad as asking people from BAME communities why they cant just accept we are all human. When of course the real question is why do so many BAME people experience racism from white people.
The derail is pretending that in society their is a hierarchy, and that is patriarchal.
So the real question is why anyone would expect women not to fight back against their oppression, which they are not the cause of, and not question why the oppressing group does not change.
No amount of identifying means you escape being part of an oppressing group, whether because you are male or white or both.