The subset groups which take themselves seriously are so diverse that the concept of white people is absurd. White people are no closer to being a big happy family than people of color are. Other than a few minor atrocities, compared to the size of atrocities of governments, why should we take the white nationalist seriously?
You did a fine job of pointing out that the white nationalist are delusional fools in the sea of delusional fools called humanity. I don’t know their numbers but I suspect they are too small a subset to be considered representative of any larger group. But other groups try to make that association in their white people rants.