Probably because a lot of people find programming fun. I am not convinced that people hold the same enthusiasm for customer service or sorting through recyclables, despite people generally agreeing that people need to be serviced and materials need to be recycled. And when I got slapped while working the register it definitely was not the fault of the exploitation inherent in the capitalist system. In fact I don’t think I would have enjoyed it even if I directly pocketed every cent handed over to me as the fruit of my labor.