Are you serious? Some of it was because of Versailles, some of it was because of the HRE, frankly by 1933 it didn't matter, these were populations that existed for hundreds of years and were as tied to their land as the countries that ruled over them. Was it Germany's fault that Versailles cut away large amounts of Germans from their country? Was it Germany's fault that the collapse of Austro-Hungary didn't lead to an immediate plebiscite and/or mass exodus? I refuse to believe this is a real argument.

You need to be pragmatic. Borders change all the time, and as long as an actual German homeland exists, they would have infinitely been better off moving back there than being a minority somewhere else. Living somewhere for a hundred years is not an excuse.

Ever heard of magic dirt? Germany only exists because ethnic Germans live together.

Capitalists will always turn on their allies whenever the time is right, nothing is new or surprising there.

Then Germany surrendering would have made that a reality much sooner, rather than later.

Explain why they leveled Königsberg, and why no city, even Leningrad, did not receive a similar treatment.

Because every side back then was ruthless? I never claimed otherwise.

What I don't claim is Britain would waste their bombs on a country that has already surrendered to them. A new German leader would have been installed and ironically enough, they would be sent to fight Russia anyway as part of a new Western Coalition. Missed opportunity if you ask me.