Adulthood used to begin at 13 or so across the world. That didn't mean a 13 year old was going to run the tribe or anything, but then, a junior developer doesn't run the software company either at 25. But adulthood meant having responsibilities, obligations, and being expected to make your own decision. Our school system is designed very specifically to prevent this from happening.
Given that, it does sort of make sense that IF you're being subjected to that sort of psychological abuse, perhaps we can't expect you to be able to make responsible decisions. Those who can generally are the exception, not the rule.
Perhaps rather than drawing all these lines though, we should be seriously considering getting rid of a school system that was modeled off of the Prussian model, which the Nazis were known to enforce, and which is still the ONLY option even in modern day Germany, regardless of how much the parents want to or are capable of home schooling children.