Board Thread:Questions and Answers/@comment-29614334-20160813074156/@comment-2059440-20160815201056

also the term we use is "Hostile Species", rather than "evil".. hostile doesn't always mean unspeakably immoral.. just hazardous.. which many alien cultures are, regardless of their collective morality (heck, humans are hostile in many ways, we just haven't encountered other species (in Extinctioners humanity is treated as a Hostile Species and basically becomes the alien invader, as an example of this).