How did the conquistadors justify their conquest of the Aztec and Inca empires?

The conquistadors justified their conquest of the Aztec and Inca Empires by citing religious ideology, wealth, and strategic benefit. The Spanish conquistadors frequently believed that it was their Christian duty to “save” the native people from the “sin” of idolatry. The conquistadors also sought wealth from the lands they conquered, in the form of new resources, people to enslave, and tribute in gold and silver. Finally, the conquistadors also sought strategic benefits. By conquering the Empires, they sought to extend the reach and power of the Spanish empire.