And what happens when that "90%" includes all the teachers, law enforcement, hospital workers and fire crews? . . . Most people do the least-worst job that allows them to keep a roof, feed their kids and keep the lights on. . . . Would you do a dangerous, unpleasant, stressful or demeaning job if you didn't need to? I don't see those sectors having many volunteer workers.
My mother aspired to be a nurse from youth. First she volunteered as one. Apparently volunteer nursing is a thing. She would complain at times about the nursing administration bureaucracy or the physical exhaustion that pervaded her week. But still she loved it. She is retired, but still keeps trying to volunteer from time to time, despite frail health. My stepmother was also a nurse and volunteers as a social worker. I've heard of volunteer firefighters and volunteer policework. I also have known two professional policeman, and neither of them were the dumb or lazy people who just can't do anything better that you describe. The fact is, none of the teachers, nurses, firefighters, and cops I've seen or met match that description at all. Quite the opposite, really. Very generous-hearted people, for the most part. And quite intelligent.