You could say the same thing about the romans or saxons. What happened to the Native Americans was a tragedy and unplanned (IMHO) genocide. But comparing it to Nazi germany is silly. This thread is more suited for the speculative history section.
And the Aztecs were a blood cult bent on regional domination, sacrificing enemies in gruesome fashion to pagan idols and entertaining themselves with bloodsport that saw losing slaves have their heart ripped out in sacrificial fashion.
But for some reason they were made victims to spanish tyranny by political correctness.
Apparently white skin and gold hunting trumps all other evil, even if it's more imperial, more oppressive and more blood thirsty than any western dogma has ever rationalized being.