The point is that allowing kids to work is clearly not as egregious as forcing them to attend prison-style schools, and yet we punish the former and support the latter.
> forcing them to attend prison-style schools
That is not true for most kids. If your parents pay for one of those camps for troubled teenagers, then it is prison like. If you commit crime then yes, your school will be prison. If you have enough behavioral issues to end up in one of those special schools, it gets closer to prison.
But no, schools are not prison like for overwhelming majority of kids. Going further, majority of kids has neutral or positive attitude toward schools. Some hate it, but they are minority.
The 18th birthday is not a magical doorway.
Now who's blending "legal consent and practical capacity for decisions"?
To argue otherwise would be odd. Perhaps you have misparsed my comment.
We chose an age that made sense to us, because the law needs an objective anchor point, not a philosophical one. However, just because the age makes sense to us legally and socially, doesn't mean it's enshrined in natural law, and we shouldn't necessarily view it as such.
Edit: Below I am replying to the reply to this comment here because apparently 5 posts in an hour and a half is enough to trigger rate limiting for me.
Yes, that is too young to make that decision. You can throw any hypothetical, emotional situation at this and the answer will be the same.
Do I think some 15 year olds are perfectly capable of deciding to work? yes. However, I think it's prudent for us to ignore those few and assume not, simply because there is no universal test for competence, and the vast majority are not.
I assume similar laws exist in other countries, and hence societies recognize the capacity of minors to consent to some things.
No. That bit is obviously not in the brain.
In Alabama, for example, anyone over the age too 14 can consent to medical treatment.