I find your lack of faith in the volume control disturbing. Last I checked, placing earbuds into one's ears is not, in and of itself, harmful. If a child is too dense to keep the volume at a level where it won't cause them physical harm, the earbuds should be taken away. I'm not certain a young child is mature enough to handle such a responsibility. But for a teenager or older child who should be able to comprehend pain and how it relates to them, I think you're being a little harsh on the parent. You never specifically mentioned the age range of the "kid" in question, so I'm not sure whether to agree with you or not.