You aren't: you are trying to defend the silly notion that a group of white people are homogenous even if they have different languages.

You state such a thing (diversity) cannot EVER possibly be true. The OP and I testify otherwise. From lived experience - mine with nothing to do with Switerland (or Canada in case you are guessing).

Consider today then whether the Serbo-Croation war could ever be possible under your model of reality (who would fight who?). Except it was.