In his epic anti-A.I. work from the mid-1970s, “Computer Power and Human Reason,” Mr. Weizenbaum described the scene at computer labs. “Bright young men of disheveled appearance, often with sunken glowing eyes, can be seen sitting at computer consoles, their arms tensed and waiting to fire their fingers, already poised to strike, at the buttons and keys on which their attention seems to be as riveted as a gambler’s on the rolling dice,” he wrote. “They exist, at least when so engaged, only through and for the computers. These are computer bums, compulsive programmers.”