"can't be taken away" here means "can't be taken away by parents."
Different countries fall in different places on the scale between "a child is strictly a property of the parent, with which the parent may do as they wish", and "a child is a human being which the parent has been given an obligation to protect from harm, but not to control." The US is a lot closer to the former, most European countries, and especially the nordics, are much closer to the latter.
The former enables parents to send their kids to a private school with a decent curriculum if the state school forces propaganda on them, but it also enables parents to send their kids to a school where they teach creationism or prohibit being gay. The latter prohibits teachers from taking away children's rights to get a tattoo or use nail polish, but it also doesn't give schools the right to punish children for infractions or take away phones.
Those are extremes of course, and most countries fall somewhere in the middle, but that point is different in different countries.
Different countries fall in different places on the scale between "a child is strictly a property of the parent, with which the parent may do as they wish", and "a child is a human being which the parent has been given an obligation to protect from harm, but not to control." The US is a lot closer to the former, most European countries, and especially the nordics, are much closer to the latter.
The former enables parents to send their kids to a private school with a decent curriculum if the state school forces propaganda on them, but it also enables parents to send their kids to a school where they teach creationism or prohibit being gay. The latter prohibits teachers from taking away children's rights to get a tattoo or use nail polish, but it also doesn't give schools the right to punish children for infractions or take away phones.
Those are extremes of course, and most countries fall somewhere in the middle, but that point is different in different countries.