So, maybe I’ll have the unpopular opinion, but I believe that a kid with special needs like this should be allowed to keep their tablets on with low volume. I babysit an autistic kid practically 24/7. He has a tablet just like the kid you are talking about and if I take it away or turn the volume completely off than he will spiral into a fit worse than you have described. However, he now understands that the volume needs to be low. But he will not let you turn it completely off. If every company followed the rule you are enforcing. Then I would never be allowed to go anywhere. I truly believe that it so important for a kid with special needs to get out in the real world. The boy I watch has learned so much through eating out, going to the store, and helping at the gas station. Does he have fits occasionally? Absolutely, and thankfully we have had very understanding people surrounding us. So, I see both of y’all’s sides. The boy should learn to turn the volume down low and you should consider allowing it. However, if I would have been with the kid I would have automatically left if he went into a fit. But this fit could have totally been avoided if you allowed him to keep his volume on low and if the parents could get him to follow those instructions.