I don't think how it is even debatable that the guy was a full mysoginistic asshole. It is pretty clear that he hated all women and that every men that he hated as well was because they get along with women. Well, either that, or because they were unfortunate enough to share a flat with him, too :/
The crux of the matter for me is to whetever ideology fuels actions, that is, if it is psychology what models ideology, or if it was ideology what modelled his psychology. Did mysoginia turned him into a bitter sociopath? Or did his bitterness and sociopathy turned him into a mysoginistic (and racist) piece of shit?
From reading his ramblings, I think that it was the latter. He was clearly unable to cope with rejection, so he had to rationalize his failure by projecting faults into the people that couldn't stand him: girls are whores, my flatmates are thieves, my relatives are selfish, yadda, yadda.
For narcissist people, the blame always lays on others and the world at large since they are perfect and flawless. He strieved to get female attention far more than he tried to get any other type of validation, consequently, he was rejected by girls more than any other people and thus, he focused the lionshare of his hate and anger into women more than anyone else. Of course he
needed to pour mysoginia into his head. How else would he made sense of the world and his shortcomings? By admitting that he was less than great?
Or we can pretend his views were just crazy and not echoed by a frankly terrifying amount of people while also sympathizing for for the poor lonely bullied kid.
Thankfully most of his views are not echoed by anyone in their sane minds. I sincerely doubt that even the most old-fashioned, ardently sexist, bigoted men would ever argue for putting all women in concentration camps or leading a "revolution" that ends with a female killing spree. Not even the freaking Taliban or Boko Haram thought about something like that. There is a huge cognitive leap between "make me a sandwich, you evil she-witch" and "I am going start killing random women in the streets".