Why are the Spanish committing such brutal acts towards the Indios?

im the bozz no matter what

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939