ImGoingToHellForThis

This line doesn't work on those people.
They acknowledge that minorities are treated badly, and think that's fine.

It's almost like you need an abstract concept of a nation to define an other and define yourself superior

OK, I'll bite.

For some, maybe even many, the problem with becoming a minority in your own country has nothing to do with poor treatment, and rather has to do with identity and diversity. Perhaps the big irony here is you cannot have diversity without a concerted effort to preserve the origin of each individual identity within the diversity, simply because geographic minorities always end up naturally assimilated.

Tons of people out there on the other side going "this isn't a problem" is just going to come across as disconnected from reality by those that actually live with the daily consequences of their identity being assimilated. There's no clearer evidence of this than the very real problem of languages dying out globally, but it affects many other areas including local customs and attitudes, religion, sense of community and family, food, traditions, etc.

I don't know where this idea that only the left cares about identity politics has come from. It's a bunch of bullshit. Identity permeates just about every aspect of politics, from all sides, from race and gender, down to socio economic class and national identity. It's really just about competing priorities about which identities to cater to more.