I don’t know why you’d think “being interested in nerdy stuff like computers” would somehow translate into virtuous behavior. They seem like entirely different things to me, in the sense that I wouldn’t expect a writer, or a baker, or a chef to have typical ethical behaviors as a group. “What happened” was just that some people got rich and powerful and their real personalities showed through. This is not a new thing…
Nerd-dom has also somehow merged with the world of fantasy and fandom. These are subcultures obsessed with hero journeys, morality tales, escapism, and cartoonish black-and-white ethical systems. I don't expect such people to handle fame and wealth well at all.
Star Trek, Star Wars, Dune, LOTR, Asimov, Clarke, Hobbes, are all nerd-dom mainstays, like D&D.