This is a rehash, with extra sprinkles, of your original false premise, it's fallacious, there's no other way to express it.
I mistakenly thought for a moment you were being serious, to throw in class struggle isn't worthy of the slightest consideration, at least not the way you framed it, you might as well throw in football hooliganism and fights down the boozer for all the significance they had for society then, and still do, compared to the problems generated by multiculturalism now. As for the NF, you're talking to the ex President of Bradford University Student's Union who protested many a time against the National Front, was threatened with legal action by them, physically assaulted by three of them and organised a Rock Against Racism concert against them in Bradford. The reality was even at their height the NF were nothing, they were very patchy, there was a real Cockney, east end docker vibe to them, they had no real traction with the broader white working class, not socially, not politically. The world of the late 70s is unrecognisable to today, we were still talking melting pot back then, multiculturalism! What the fuck was that?