In 1939, when Germany attacked Poland it had two goals. One was the return of certain territories which had been taken away afer WWI to reconstitute Poland. The other was to be able to expand eastwards as envisioned by Hitler. Poland wasn’t a poor victim bullied by nasty old Germany. There was a history dating back centuries between both countries with them fighting over the same territory. Sometimes Poland claimed it. Sometimes Prussia/Germany. Just after WWI, Poland actually attacked Germany for territory.
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You're seriously suggesting that the country which Germany planned to essentially exterminate 90 percent of it's pre war populace wasn't a victim?
Yes theirs a long history between the two and yes the Brits and French had done a lot of bad things in their Colonial Empires and no one is disputing that. But Germany actively intended to not just adjust a couple borders here and their but completely exterminate Poles as a nation with a small portion being "Aryanized" and the vast majority being murdered either slowly or fast.
For Britain and France at that point it was pretty basic self defense and anyone can see that. Hitler had made no secret that he fully intended to stomp the French flat. He wasn't planning on just "correcting some wrongs" but completely smashing them as a nation and putting in place a worse version of a reverse Versailles on France. He was intending on putting the French in a position where his boot was on their neck and it would never be lifted. They wouldn't be completely wiped out as a nation and a people but they were going to be beaten and humbled badly. With the Molotov Ribbentrop pact in place it seemed like Germany and the Soviets were firmly allied and Germany could now turn westward. So the instant Germany staged their crappy false flag and went into Poland it became apparent to anyone with a notion of basic strategy and the political situation that France was next. And for the Brits just sitting by would be moronic since now you'd have an openly expansionist power hell bent on subjugating Europe and with all the resources and industries of Western Europe at his disposal (as well as potentially those European countries colonial empires as well). They'd have utterly massive forces and be all of twenty or so miles from Britain herself.
You're using the classic "Well the US had Manifest destiny so Germany really wasn't doing anything that bad" argument. The thing is by the 1930's and 1940's the world wide cultural norms were starting to finally recognize that say conquering a people and enslaving them was a bad thing. And Germanies plan's could be summed up as "Well look at the Congo Free State. Now let's do something like that but much worse.".
Two wrongs don't make a right. Britain conquering India in the 1700s/1800's doesn't make Germany trying to enact the single largest organized plan for mass murder in human history a good thing.
Nobody is saying that British India or French Algeria were good things.