[smt88]

> Yes, but their parents can consent for them.

The point is that there are some things so risky for kids that parents shouldn't be able to "consent for them". One of those things is child labor.

> This argument is weirdly circular.

Circular doesn't mean what you seem to think it means.

Parents have control over their children, but society has put boundaries on what they can do to them because parents are capable of great harm. There's nothing circular about that.