How are they gonna go to college? Nobody in their family went. Their friends didn't go. They have family they need to stay home and take care of (no child care, elderly care, limited food assistance) and work for, in whatever way that means. Even if they went, it's not like every millennial with a degree gets a job, even with record low unemployment. Transportation is also problematic, just to get to a school, or a job. Rap sheets keep people from applying or being accepted. There's usually no jobs program to help older people transition from obsolete industries.
It takes a lot of outreach to get anyone to trust the system, if they have a flexible enough situation to go. Most people just don't see education being a solution, so they aren't going to jump out on a shaky limb in the hopes it might catch them. Better the devil you know.