Chet Faliszek, writer on Valve's upcoming zombie co-op shooter Left 4 Dead, says he wanted to avoid pinning its zombie invasion on an "evil mastermind," instead honing in on the actual effect the invasion has on the game's characters and world.
"The evil mastermind at the end is never as good as whatever you had in your head when you were coming up with it," Faliszek says, arguing that trying to over-explain the cause of a disaster often detracts from its more tangible impact.
He cited Jan de Bont's 1996 disaster film Twister. "They had evil weathermen to justify their plot," he said. "Evil weathermen."
"What the hell? There's no evil weather men!" Faliszek exclaimed. In Left 4 Dead, "we don't make evil scientists that have created a zombie infection to stomp out the USA -- the evil Russian scientists or whatever post-Cold War enemy you want to use."