Earlier quoted context omitted.
Yep, the Aztec might have been brutal, but its hardly like the Spanish were any less so, and for similar religion fueled reasons even.
The Spanish would have been quickly squashed all the way to the sea were it not for essentially every other native group allying with them against the Aztecs because of the brutal treatment they suffered since the rise of the Aztecs. Once the Spanish had a foothold, European diseases did most of the killing.
Some people think he arrived there with laser rifles and nuclear bombs to wipe out and entire empire.
The propaganda around this is strong I guess.