What a lot of people don't realise is the reason WHY the nazi's adopted that symbol - it was already immensely popular in Europe, particularly during WWI. It was often put on planes, on helmets, on uniforms as badges etc, which is likely where Hitler got acquainted with it (he was a soldier in WWI).
To the Europeans, it was a symbol of good luck and victory, and perhaps because of it's strong usage during WWI (and because the Nazi party wanted to 'right the wrongs' of WWI) the Nazis adapted it as a symbol for their party.
So I wouldn't say the Nazi's appropriated the symbol necessarily, since it's a symbol found all over the world - they just made it toxic to a large swath of the world, which makes ignorant people wig out in certain foreign countries (sort of like how you see americans freak out about the old religious europeans who dress in white robes with white hoods, because certainly only americans (and racist ones at that) would ever think of such a unique clothing scheme right?).