I'm talking about whether or not parents have ultimate authority over their children. Why do you think murder is a special case that isn't included in "ultimate?" Many parents truly believe it is their right to kill their child if they so choose, and that the state should not be able to intervene or punish them in such situations. "I brought you into this world, and I can take you out of it." You seem really optimistic about the kinds of behaviors and beliefs parents have. Parents are often abusive and -definitely- believe their children are their property to do with as they please. For real. This is the exact kind of thing the original comment was talking about.
If you want to replace "murder" with "beat" or "starve" or "sexually molest" or whatever else, feel free. Murder is not a special case. Parents do not have ultimate authority over their children. It can be easily seen through example in the real world.
> Except that what you're advocating for isn't intervention in just those cases. You're also advocating that the state intervene in cases where: the treatment is harmful to the child, and the well-educated parent knows it, but the state thinks it's for the best, and causes harm to the child. And you're justifying it by saying the parents shouldn't be allowed to murder their kid. Which is really weird logic.
I am not trying to advocate for, nor justify anything. I'm simply saying that the state does not allow parents free reign to do whatever they want to their children, simply because they're parents. Murder is an obvious example, but the state also disallows lots of other things. If parents had ultimate authority over their children, the state could not allow or disallow anything, because they would have no say in the matter.