There must be lots of women who experience resentment for not fitting with the objectified 'ideal female' stereotype, yet they don't seem to turn into groups planning violent retribution. I think 'incels' initially included women as well. It's the male entitlement, arrogance and aggression that's the problem.
Women who fit feminine attributes well are also rewarded. I think this is a fact of human life - good looking women and men who fit societal norms and expectations have usually had greater opportunities for relationships, status and respect etc throughout history.
Agreed.
An aggravating factor may also be the fact that generally the man is still the one who's expected to make the first move, so men that aren't confident or 'alpha' will likely struggle much more than shy women. I also think that lack of financial success is less of a handicap to women than men in terms of dating (even if the basis is likely sexism - the view of man as the provider etc). Plenty of normal sized men seem happy to date a larger woman too, but you don't see many fat men with slim women unless they're rich (the man, that is).
Still no excuse but possibly contributing factors. It seems to me that the MGTOW community isn't just eschewing women but rather the whole patriarchal sociological status quo.