If Hitler didn't want immigrants he should have learned to keep his hands on his own side of the fucking border
This is true. But at the same time, without the British guaranteeing Poland and convincing them to not cede Danzig, which was rightfully a German territory anyways, the war between the Germans and the Allies would not have occurred. Though, likely, a war between Germany and Russia was inevitable.
Fault lies on all sides for WWII occurring in the first place. Unfortunately, history is written by the victors and people always wish to justify their own cause. I mean, what is the point of losing millions if the war was for naught? Of course, your point would hold more water if not for the fact that the British, French, and Americans had not done taken over nearly the entire world (along with the Spanish plus some 'minors' such as the Dutch and the Belgians) just a century before. I always find it funny when someone converts their beliefs and then shortly thereafter, condemns others. Let me give you a smaller sample of that point.
Last year, the R&A determined that Muirfield would not be allowed to host another Open Championship because they voted against allowing women as members. Now, you would think "well, that is what they get for their discrimination so it's rightfully deserved." Rory McIlroy even went on to condemn Muirfield for their actions. One major problem. The R&A did NOT admit women members until 2014 themselves. Rory McIlroy never condemned them for those actions. So, because the R&A finally saw the light and the error in their ways, they were suddenly self-righteous enough to impose their will on anyone else that held the same exact view they just dropped themselves?
Just imagine today if the British, French, Spanish, Portuguese, Belgians, Dutch, etc. had kept their hands on their own side of the f'ing border. Technology would be 100s of years behind what it is today. And even further if the precursor to all these peoples also 'kept their hands on their own side of the f'ing border.'