*Humans like to think themselves as being intelligent. So if we are so intelligent why are
we always finding new ways to kill, cheat and carry out such high levels of brutality on each other as well as damage the very ecosystem we need to survive in? How can you call that intelligent?

*Thinking only humans do this is a special kind of naive.  As one biologist noted, if ants had nuclear weapons their wars would sterilize the Earth in a few hours.

Getting back to the conquistadors, not only were the Aztecs brought down in part by some of their own victims, the conquest of the Incas was made easier because the Spanish happened upon them just as they were finishing a brutal civil war.