It's 50%, not 80-90%, and arguably because of the social script of working in a cube farm or factory, which are horrible for just about everyone, not just us. A lot more people would be self-sufficient if more support networks for alternative ways of making money were in place and more easily accessible.
Two things:
1. Have you had him screened for clinical depression or anxiety? It sounds like there might be something deeper going on that can't just be willed away.
2. Two applications is nowhere near enough for a kid just starting out. If you rule out or address a clinical issue, then work with him to seek out something meaningful to do with his time. Get him into activity groups or volunteering. If you can't get him doing things outside the house, then put him to work within the house. It's actually less "cruel" in the long run to push him to do these things, otherwise he will be wholly dependent on you for the rest of your life. He will live up, or down, to the expectations you set for him.