National Socialist here, it's because incels are dysgenic and bitter and cannot be trusted in society. Even as a khhv, i can recognize they would cause nothing but more corruption and suffering in a white ethnostate. They wish to harm women and many of who I see on .is are into very degenerate things and we cannot allow them around our women and children.
Hypergamy sucks but it's very much natural and an essential part of progressing to a eugenic bright future. Life is naturally hierarchical but some just don't seem to get it. This is also why I believe many incels need to be sterilized or euthanized as many of these types can't be helped.