It seems to me that the most famous example in history of the goyim (whites) organizing in their self-interest was Nazi Germany and that did not go well. Most people feel an inherent sense of horror and revulsion at the idea of whites organizing in their group interest.
It’s fine for every other group to organize in their self-interest — including Jews, blacks, latinos, asians, gays, women, etc — because they have historically been persecuted by whites. According to the conventional wisdom, when whites organize in their group interest, it too often leads to evil and genocide. It’s just gross. It’s unseemly. It’s uncool. It’s bad for the Jews.
Women are often the majority on college campuses but it is fine for them to organize in their group interest because women are oppressed. It’s fine for Jews in Israel to organize a Jewish state because Jews have been oppressed. It’s a good thing to want Tibet for the Tibetans but it is a bad thing to want America for white people (even though the United States was historically an 80-90% white country, now down to 62% and heading for minority status by 2042 according to census projections).
Whites are a minority in California but because they have more money and power than latinos it is wrong for whites to organize in their group interest. After all, there is no such thing as “white” as a group identity and these mythical “whites” have no group interests, no group consciousness, and no group culture.