This is mainly the result of over-protective, risk-averse parenting. To them, the best way for their child to achieve success was along this path. If their child tried to deviate from the path, they were grabbed by the scruff and forcefully put back on this path by their parents until it was ingrained in them as the only path.
To such parents, things like entrepreneurship are too risky. Their child might fail, and have nothing to show for it. It's better for their child to just go through college, get a job at a large corporation and possibly spend their life working their way up through middle-management until their seniority gains them a nice juicy salary along the way...
However, especially from the standpoint of a graduating high school senior, it is very real.
I think there's an implied "first" (or "next" after secondary school) in all of this.
I found this advice to be quite good, although I am sure it doesn't work for everyone. Then again, I never felt I was entitled to a job.
The plural of anecdote is not data. ;-)
I actually vaguely remember hearing the same lies, but not from my parents, at least not without the "nobody owes you anything" caveat.
It didn't take me long to realize, intuitively, if not explicitly, that finishing college wouldn't help me get the job I wanted. Today, obviously, it might not even help me get any job.
Even absent an entrepreneurship opportunity, I dropped out, and I don't regret it, despite the stigma it carried in the computer industry, well into the dot-com boom.
I'm definitely embarrassed for my generation that we perpetuated the lies, rather than encouraging choices, including self-employment or learning a trade.