I think you miss the point, it's not that they were morally good or only in pursuit of lofty goals. But the culture was different and the profession wasn't dominated by monetary opportunity seekers. Look back in historical newspapers and you won't find a single ad for personal injury attorneys.
That's because it was illegal for lawyers to advertise their services until 1976. See Bates v. State Bar of Arizona:
https://en.wikipedia.org/wiki/Bates_v._State_Bar_of_Arizona