"Your "legitimate grievance" adds nothing to explain the main hatred of the site, which according to the article, is anti-semitism."

Um, well you can believe what Seth (the article's author) says, or, um, you can make a very quick trip to the Stormfront home page. Seems to me that maybe ~20% of the thread subjects relate to Jews. The other big two topics are black-on-white violence and immigration. It is in those two topics where I think there is a considerable amount of legitimate grievance.

"It's hard to believe that "Jews run Hollywood" is enough to explain that."

No it's not enough, that was just one of many examples of pattern matching.