A lot of students have ideas of what they want to do, but no reality.

My sister got a psych degree because she thought she wanted to be a therapist. She never volunteered at a mental health clinic or as a counselor. Unsurprisingly, she realized she didn't actually want this career, but managed to segue into a grad degree in I/O psychology and got into high level HR and is making good money now.

My cousin was the opposite. He loved mechanical stuff as a kid, always tinkering and building stuff. He ran the robotics team, got into drones and R/C. Loves flight sims. He knew exactly what he wanted to do and got a degree in aerospace engineering. Landed an internship at Lockheed and converted it to a full time position.

Most people going to college should be like my cousin, but are like my sister, except instead of finding a productive option, they become leeches, like you said. Although, it's worse than leeches since they start acting out of spite to overthrow society. Instead of burning down a Starbucks that provides jobs for low-skilled individuals, they should be beating up the teachers that failed them. Very few of our teachers are setting up kids for a realistic path in life with realistic expectations. One of my friends is a high school teacher and he's trying to set kids on the right path. He always suggests skilled trades for kids that he sees clearly can't compete in our modern "academic" environment.