There's no way the aliens didn't have plenty of bad history of their own. They probably just collectively decided to forget about it, propagandize the crap out of themselves, and silenced anyone who wouldn't shut up.
I enjoyed the story where the arch demon turns into a quivering wreck crying and wanting to go back to he'll because it's safer than earth context he went into the mind of a Verdon combat veterans mind
Xeno: Those humans *could be very violent, they *might attack us some day, we should give them a reason to do so. Humans: Such violent xeno's. Bad xeno's! Human spank now!
That which you enjoy, you will learn so that you can take your time doing it. That which you dislike, but know you must do anyway. That is what you get GOOD at in order to complete it as quickly as possible.
