Promoting your ideas as "western civ" in order to give them polish is an unfounded appeal to authority. The fact that Europe succeeded despite not sharing your views shows why this appeal is wrong.
Please keep your internal politics at home, and don't get us involved.
I'm not willing to accept your pushback on its face, but it certainly has me thinking a bit more about my own assumptions about what we share with Europe.
I'm still in the dark about what has made you hostile to whatever you think the American "far-right" is advocating. If it is some of the ideas I listed that would be good to know. If it is some mistaken understanding about what the "far right" is in America, that would also be good to know but I can't really tell from your comments.
As for multiculturalism, your comments suggest that your use of that term is not the same as mine. Multiculturalism from the left is not about assimilating people from disparate cultures but instead is about insisting that the ideas I listed above aren't to be valued and instead all cultures and ideologies are to be accepted as is, leading to balkanization, discord, and the devaluation of the ideas that have made the "West" and America successful.