Part of it was, most of it wasn't. And its really not relevant: Tons of gold and economic value that was extracted from the local Spaniards, local French, local English, local Germanics weren't given to their feudal lords voluntarily either. It was the political setup of its time. As a result, proposing something like this based on the standards of today sounds at best hypocrisy, at worst, dumb.

The native Americans became Spanish subjects in 1519. With all the good things and the bad things that being the subject of an average European feudal kingdom brought along with it.

Nobody declared them 'non-human' and started eradicating them like the English did. That's what you should be being cynical and sarcastic about.