Elliot Rodger was not a symbol of anything other than severe mental illness. Unfortunately, younger, self-styled "feminists" have gone on rant after rant after rant trying to take apart this batshit crazy individual's "manifesto" and to claim it is typical of the already deranged "men's rights" mobs. Those MRAs, in turn, are supposedly representative of the rampant "misogyny"--a term I completely and totally LOATHE because it signifies nothing and sugarcoats what should be called "sexism"--in our society.
Meanwhile, people like Rodger go untreated or misdiagnosed and have access to guns. People like him gravitate toward boards like the "incel" or PUA boards, boards by and for misfits looking for validation and reinforcement of their crazy beliefs. However, even in those nutball environments, Rodger stood out with his insanity.
Just because somebody can write 137 pages and be able to cobble together sentences and paragraphs doesn't mean the person writing it isn't batshit. Rodger was. A couple of generations ago he would have been correctly diagnosed and institutionalized. He should have been in today's world.
Rodger hated EVERYBODY, not just the "pretty blond girls" who supposedly "rejected" him. His extreme envy toward the guys who could "get" the girls manifested itself in even more hatred.
Rodger was misanthropic more than he was a "misogynist." It's reflected in his victim count.
The hatred, though, was a symptom and not the cause of his mental illnesses and violence.