Unfortunately, while it seems like a greater social good for these students to enter into social work and teaching, it can also means they have a hard time paying off their students loans and getting ahead financially (or even doing okay financially) in life. I think there is some truth to the idea that wealth begets wealth. My dad is one of those “Midwestern millionaires next door” types – you would have no idea how much money he has because he lives a frugal life. But he pushed all his kids to get degrees in areas that would provide a solid living, and had plenty of little tips over the years that seem obvious to people who are good with money – but might not be discussed in low income households. Pay off your credit cards every month, take care of your cars and drive them for a long time, pay cash for cars as soon as you can get to that point and don’t buy anything super fancy and expensive because they just depreciate, invest, save for retirement starting early, cook and eat at home a lot, don’t spring for $4 cups of coffee, mow your own lawn and move your own snow if you are able. 
(Literally all things my dad says – and he is still mowing and snowblowing at age 89!). Now do I think everyone should major in high-paying majors? No… the world would be worse off. But I think all students should be more aware of their choices and the financial consequences of those choices. And I think if they were, a fair number of them would make different choices.