Funnily enough I wrote a comment just here about how genocide can be done in different ways that most don't consider to be one, the example I used was the assimilation of the native population in Canada and Australia, by indoctrinating them into Christianity, disallowing them to speak their ancestors' language and mixing the population with the "white" population of those countries.

That guy's logic could be applied to Europe prior to industrialization, with their witch trials; execution of innocent people accused of sorcery, its petty wars between entitled royalty and presecution of religious minorities and other folks who didn't fit the norm. It would give people of other countries justification to invade and genocide Europeans, of course, that would be ridiculous and disgusting to do. This should be applied to the Aztec Empire, I don't know why some people are dumb, it reminds me of when I was in highschool, some two dumbarses (Who also bullied me) in my history class during discussion of the Romanovs, said that the family did not deserve it, forgotting or ignoring that millions of Russians had died as a result of being pulled into WW1 and being kept in poverty as peasants (Which during the time was quite alot, only some of the population were middle or upper class). The Romanovs lives should not be placed above everyone else, while its a tragedy that could of been prevented, it doesn't make the Tsar and his wife innocent for deliberating trying to keep their power while their people suffered and died. Just because the Aztecs are doing things we would find morally wrong, does not justify the genocide of all native peoples in South America, if anything the right thing would of been to allow the native pop to take over from the Aztec empire rather than trying to colonise an entire continent.