It's not difficult to understand that ears are complex and sensitive. Just a little physical education could help illustrate to children that preserving their ears is of some importance. The problem is not non-isolating earphones. The problem is ignorance.
Also, I mentioned social education. Regarding non-isolating "earbuds", god help us, please educate people that those not wearing the earbuds probably do not want to hear your crappy music; and if you turn it up loud enough to drown out the ambient noise, then you will be essentially providing a narrow band public performance of whatever you are listening to.
Meanwhile, for less than $200 you can have some exceptional Shure in ear headphones that provide pretty flat and efficient response while simultaneously blocking out as much ambient sound as active (more expensive and battery operated) headphones do.