What the heck is Alt-Right? Not sure I agree with Slater, at least not without serious qualification, but these are definitely thought-provoking points, especially the second.
I know very few people who would talk openly about the need to preserve 'white' culture, but many do speak of an attack upon American culture, or Western culture. The growing equation of American culture with white culture, with special emphasis on its inherently racist and oppressive tendencies, may have the (perhaps) unintended consequence of pushing white people to identify as a group that's come under attack and, by default, caused them to rally together collectively. I'm sure there are white men and women (especially men) who find some strange psychological solace or even enjoyment in playing the role of victim in this new scenario, but I also think a distinction should be made between 'dreamt-up' and reasonable grievances.
I think we can all agree that the last 40 years has hit the middle and lower classes of all races hard, very hard in fact, and, in the US at least, the Democrats - who would appear to be the historical and ideological representatives of this demographic - have purposely fostered an emphasis on identity rather than class-based politics. I also think an argument could be made that 'progressive' intellectuals who push things like multiculturalism and identity politics could be the cause of increased white racism, precisely because they purposely go out of their way to highlight differences amongst people based upon race and ethnicity and sexual orientation - black culture, Latino culture, LGBT culture - and then refuse to allow straight, white men to have any identity beyond perpetual racist or bigoted oppressor.
So this group has been backed into a corner and forced to assume an identity, irrespective of vast social and economic differences, with no legitimate effort being made to find another, more transcendent and inclusive one. You are white, therefore you are the new 'other' who must be demonized and marginalized. You will be able to maintain your livelihood and profession as long as you don't voice any 'pride' in your background, or voice your displeasure that other groups are allowed and even encouraged to do so. There are reasons for this discrepancy, but they've been articulated by people much smarter and more educated than yourselves, largely within the comfortable confines and abstractions of academia. The motivation may have been pure (correcting past and current injustices), but the best way to overcome an unjust hierarchy IMO is not an inversion of the old one in favor of a new, but rather searching for commonalities beyond accidental differences of birth.
I'm partial to certain Romantic critiques of the Enlightenment, but I do appreciate the latter's universalist tendencies and lament its apparent demise in this day and age. Very sad. I 've always felt this to be one of the great things about America: I have zero sense of historical identity to European ancestors, I have married a woman of indigenous Mexican heritage, we have children that are (obviously) mixed race, and all of this is seen as pretty normal in the part of the US where I live and grew up in -- oddly one of those maligned white suburbs teaming with Trump supporters. These are non-issues to me and to most of the people I know, but others want to push a divisive race narrative that makes them more relevant than they should be. That's my limited experience at least.
Whatever the case may be, ending the blame game and searching for viable solutions that DO involve a new sense of shared identity and ethos needs to begin ASAP. This obviously gets into complex matters that try to balance the preservation of multiple cultures and identities while also facilitating the aforementioned transcendent sense of belongingness which encompasses each of these separate groups. Or we all blend into a homogeneous and dominant culture, regardless of race or ethnicity. Can't have it both ways, though, at least not as far as I can tell.