The Conquistadors were basically the Allied armies rolling into Nazi death camps. They were Heroes for wiping out the nightmare
More like the Russian army...
The small number of Spaniards, regardless of their superiour weapons, could not have done this alone.
They had the willing help and support of the surrounding indigenous tribes whom the Aztecs were terrorizing, killing, and using as slaves and sacrifices.
Aside from consideration of the rest of the Spanish atrocities; in this case they did the new world a favor by eliminating the Aztecs.