For one, kids of poor families can’t really afford to go to university to peruse happiness over money. They don’t want to become poets and musicians because they have a family to support.
If you’re a poor kid and you get into Harvard you get a full ride. Furthermore, even a degree in poetry and literature from Harvard will be your ticket to the middle class. For Harvard students there’s really no excuse not to study whatever you’re most passionate about.
I don’t know anything about you but this sounds out of touch. When you are coming from a poor family you look to maximum financial earnings, not pursue your passions. Financial security is the top priority and you don’t achieve that with a degree in poetry. You study STEM.