So, I hashed this together to address the issue of legal right.
I agree with that. I like most people tend to believe that Countries that are older than I am are legitimate, changes during my lifetime are debatable.
I think that's true of most of us.
I am German by ethnic heritage, and enjoy studying German history, but it's probably not a good idea to re-visit German claims to Prussia and Silesia, ceded to Poland by Soviet administration well before my time.
They've been Polish a little while now, the last dust-up over the matter got kinda messy....