you can do whatever you want--you just have to be willing to pay the price. even someone living check-to-check could go back to school if they were willing to work 20 hours a day and possibly live in their car.
....just at the hope of having a house in the suburbs lol.
here's my perspective as an old man: unless you have enough money to NOT WORK for the rest of your life or are on the track to retire much earlier than 65, you don't really have shit. at least nothing worth feeling superior about.
you do however have dreams and passions that could possibly be fulfilled despite your financial situation.
the person in the OPs story is just driven by justice and possibly revenge. but it's not as big a deal if you frame it like that.