You may think im being hyperbolic, but this is a very real situation if the longshoremen, truck drivers, and loaders all lose their jobs to automation with a few years of each other. This is especially true in LA as those jobs make up a significant percentage of employment in that area.
Other reasons also come to mind. When someone is out of work tax revenues decrease and a variety of social costs can increase. Infrastructure costs and welfare expenditures are immediately impacted. The unemployed person is still using public roads & services, but no longer paying taxes to fund them. If the displaced employee gets hurt, then emergency services costs increase. If they turn to crime, court and jail costs go up. And that’s a cursory list of impacts. So there are many ways society pays a price for automation.