If you walk down a street in Guatemala, Honduras, Peru or Bolivia you see thousands, no, millions of native Americans living in those and many other countries. How many "native americans" you find walking down New York or Denver or Wichita...? The US Cavalry did a better "final solution" than Francisco Pizarro, anytime.
Of course, Conquest is that: conquest. Many countries had conquered others, Mongolia, China, Japan, Korea, Arabia, Egypt, Greece, Persia, Rome, Germany, Russia, USA, Britain, even Sweden. And a great number had not behave well when conquering, specially the eastern ones but not exclusively. Can we condemn the conqueror for being the hunter? Can we condemn a Lion for being a predator, or a Tiger or an Eagle? I don´t think so. It´s just natural.
Spain, Holand, England, Belgium, France and Portugal: all of them were conquerors, colonialists and slave traders (one time or another). Spain has been denigrated also because of their adoption of the catholic Inquisition which is widely viewed in the scope of protestantism. Things that were bad are made look uglier.
An appeaser is one who feeds a crocodile, hoping it will eat him last.
Sir Winston Churchill