Burnout let the thought trail off as a rush of warmth filled him as an injection of his happy drug hit him. The chemical substance that kept him in line. Hatred was a good thing. The docs said it helped keep him alive, helped to keep his willpower up. But they didn't want him to overdo it. Thus they put the drug on an automatic injector. Measured his adrenaline or some such drek, and if he wasn't in a combat situation, it kept him from going off and massacring innocents.