Might it not have something to do with the fact that are of a race that is discriminated against by law through affirmative action, is dwindling relative to non-white immigration, and frankly well seems on the path toward oblivion?
I think you're falling into the whole 'race' trap that you have correctly (IMO) condemned the Nazi types for. Do not be concerned for 'the preservation of the white race' (whatever that is). Be concerned for the preservation of liberty and justice for everyone, whether their skins be white, black, brown, red, or purple with pink polka-dots. Some of the best arguments against affirmative action, for example, have come from African-Americans like Thomas Sowell and Janice Rogers Brown.
Ideals matter. Race doesn't.
I most certainly agree that ideals matter. And I'll add that race consciousness can be very dangerous, but I don't think race will ever just go away. It's too much a part of what every person is whether he or she knows it or not. It shouldn't be allowed to make us lose sight, though, of higher values and our other ties to our fellow humans. It's a complicated topic, but just to let you know, I fully support equal treatment of citizens under the law.