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The 'abuse' in that scenario being the fact that the parents are ignorant or uninvolved enough to let it happen.

is there some unspoken assumption here? Myself and my friends all have videos of our kids dancing at many ages. None of it is considered csam

If you're posting it publicly then yes it's very likely that it's being redistributed in a pornographic context.

What's next? We should ban all photos of winter forests because arbophiles might get off on them?