Fighting the soldiers of other nations on the field was a duty of all men, but the Mongols were different. They did not want to conquer to rule in the stead of the nobility, they wanted to annihilate everything different to them, to destroy civilization, to destroy and rape and kill and nothing else. They were war for the sake of war, a pestilence upon the world, and Gawain saw their deaths not as the honourable meeting of foes, but the extermination of a potentially lethal pest.
— Narration, A Scotsman In Egypt
The plot involves war between the humans and the Kilrathi, who have refused all offers of peace and wish only to be targets in the crosshairs of video computer screens. Indeed, according to a Web page, they hope to "destroy the universe," which seems self-defeating.
Boy, I’m sure glad Star Trek evolved from those simpleminded days of having Klingons as an all-purpose, two-dimensional evil race constantly sending out deranged commanders for the Federation to take down, into our current sophisticated era where we have... well, exactly the same thing, only now we call them Romulans. We’ve... come a long way, baby?
"Reapers may look all evil and crazy, but there's a good reason for that. They ARE evil and crazy!"
It is not that the Angrborn always seem horrible. You get used to them. It is that they really are horrible, that being horrible is being like the Angrborn.
The Ork is mankind's oldest foe. When we first journeyed to the stars, the Orks were there to disabuse us of our naivety, and they are still here to test our courage and will to its breaking point. They are Beast that stalks the stars, the Wolf at your door, interested in nothing but destruction. Look to your weapons! Steel your hearts! The Green Tide is upon us!
— Commissar Yarrick, Warhammer 40,000
Haley: Hey, wait a minute — aren't dark elves evil?
Nale: Oh, my, no. Not since they became a player race. Now the whole species consists of nothing but Chaotic Good rebels, yearning to throw off the reputation of their evil kin.
Haley: Evil kin? Didn't you just say they were all Chaotic Good?
Is it possible for any creature, any living being, to be inherently evil? Such an assertion may itself facilitate the committing of evil acts. By viewing any person as inherently evil, we take away his ability to be anything else. All actions are seen as being motivated by the individual's evil. Even acts of kindness are questioned, and assumed to have ulterior motives. Thus the person is never rewarded for behaving properly. Similarly, by defining a person as evil we also give that person free rein to behave as he will. After all, he is not responsible for his evil nature and thus he feels no compunction to behave properly.