Why would you assume that was the fault of computers? There are many social, economic, and policy changes that would have much larger effects.
Computers are still a significant factor because most new tasks created were cognitive and needed university education. Or another way, the automation that computers brought eliminated jobs in labor, but we did not create new jobs for those people. The three others were instrumental in that side of the equation.
The jobs created for the factory workers and the former professional retail workers, in the 90s, were in big-box stores.