Jerome Bixby,
Vengeance on Mars!
“ Life was cheap enough out here on a red world where red insects bred in your eyes and red beasts swallowed you and let their juices do the killing, and it took a good man to fight the alien fight. But when the wrong kind of man came along, it was a knife in the back and life had no price at all. That kind of man had to be reckoned on, Hale thought bleakly—the bad penny that wouldn't even go away, hard and shiny and newly made, like Randy—for values slipped in the rat-race that was any frontier, and the urge to prey, for profit, for power, lay close under a man's skin. Hale sighed. ”
