Um, let's see... Because believe it or not, they just may care about people? My aunt is a dentist, and she sure as hell tells her patients to brush their teeth, supports fluoride in the water, and doesn't give sugary candy to kids. If she had to choose between end oral harm and having her job, she'd choose the former. Assailing the nature of every professional is just not fair. Many people, if not most, get into a field because they *care* about people or their chosen work. To broadly say that absolutely everyone just works to make as much money as possibly is too cynical for even me.

As for putting people out of business, have you noticed that technology somehow manages to create enough work to make up for the jobs that are lost? Look at employment now verses across history. I don't see the trend where more advanced world => more unemployment, do you?