You seem to have a racist attitude toward the Spanish.
I didn't.
They did the same as any other human culture would when presented with an abundance of natural resources controlled by a militarily weaker and less advanced society.
As President Teddy Roosevelt said (paraphrase) ‘it is ridiculous to assume that North America would remain the last great refuge of horticultural sooty and not be replaced, as it was elsewhere all over the globe, by an agricultural society.’