Except in reality his targets weren't entirely dead, there were still millions left so he still went about killing the rest[0..2].

The intent in this case existed alongside unintended causes, but it was still there.

[0]https://en.wikipedia.org/wiki/Spanish_conquest_of_the_Aztec_...

[1]https://en.wikipedia.org/wiki/Spanish_conquest_of_the_Inca_E...

[2]https://en.wikipedia.org/wiki/American_Indian_Wars