It’s because of our economic system being build upon people having to work to get money to live while at the same time naturally “the system” is trying to be more and more efficient so less and less work is needed. It’s an inherent problem which becomes more obvious with AI. Imagine a world where robots are doing all the work. Wouldn’t it be great? No one has to work anymore. I think it would be possible but only with a radical systemic change how our societies work. Also, I don’t think we are even close to be there, but that would be the goal, wouldn’t it?