Having done a whole lot of reading on the exploration and population of Mexico - specifically the two Californias - I've come to the opinion that history is written to favor whoever is writing it.
Ask a California Indian their view of California history and they will give you an entirely different view than those in many text books.
Any examples?
The Kumeyaay tribe in San Diego fought against the Spaniards when they first came to the area. Even then, hundreds came to the mission seeking a regular source of food and protection from the elements. They were never in chains and many were allowed to leave to attend special events and rites. The friars treated them as if they were their own children, punishing themselves far worse than any native/Gentile miscreant.
However, according to many California historians, the friars treated the tens of thousands of natives that came to the missions as slaves. As there were never more than 150 soldiers split between 4 presidios and 21 missions, how could they possibly "enslave" thousands of natives?