You’re right about one thing - I do disagree with you
I should probably qualify that; what you’ve described here is pretty much what exists in Sweden, Norway, Denmark right now - a hardline Nationalist party not picking up enough votes to rival the two main parties but significant enough to ensure that neither has overall majority and they take the Kingmaker roll - a bit like the DUP but louder
So far, in Sweden at least, the other parties have refused to form coalitions with the Nationalists. Not so in Denmark and Norway where the Conservative parties have invited the Nationalists to form governments in order to get them over the line - a bit like the DUP only less devolved
So while I agree that such a thing is a possibility in the UK (though the lack of PR in the UK ironically makes this less likely than actually splitting parties - such logic being how Cameron got us here in the first place) I do NOT agree with your implied interpretation that letting the Nationalists have this one will assuage their ambitions.
Quite the reverse, it will empower them both politically and out on the streets
…and then what? Where will it end? How many people will be told to ’go home’ (or whatever the vernacular) ?
The heightened fear of being subjected to discrimination & othering is already present…how will it be post-Brexit when the economic conditions really kick in? When people feel the real crunch of the shrunken state apparatus & the market takes over everywhere? Do you think the aggressive Nationalists and racists will just turn into nice people? Of course not. They’ll want new scapegoats, they’ll want to burn the hijabs, kick out the blacks and expel the Jews because they stood up to the EU and won so what’s a few mongrels and intellectuals ? Send ‘em back
Honestly, it’s the economic conditions that’ll bring neo-fascists to Westminster on the back of the misery of others & those conditions will be far worse post-Brexit