Contested Legacy of the Conquistadors
historytoday.com
historytoday.com
tl;dr.: Atahualpa was taken to Spain on his own wishes, for having done a great job, what ever job this may have been. The rest of your account may well be a folk believe. Elvis is alive!
Same happened to the native Americans in the US.
Of course not everyone was the same, but they were the exception. If you want to read something more positive and inspiring look for Cabeza de Vaca or Bartolome de las Casas for example. They tried to improve indigenous people's rights, or at least enforce the existing law, which gave them some protection but was ignored.
That still makes them pretty bad though, even if there is a somewhat rational reason to be bad. Their badness was one of their tools in the conquest.
[1]. https://en.wikipedia.org/wiki/Seven_Myths_of_the_Spanish_Con...