> why build a Lutheran school in an Apache reservation and not expect them to integrate...

They built to school specifically to convert the locals and destroy their culture. The explicit goal of building the school was the direct opposite of "...integrate some degree of their own culture..."

Google at least partially participated/volunteered in that, right?

They were not. (Though IIRC it was unclear from the leak that the IC were successful in targeting their servers; it just indicated that they had a good idea of how they might do that.)