 This is sane, socialized behavior, and it shouldn't be controversial to enforce it. One may argue that adults are doing this too. Sure, adults who don't know how to have relationships and struggle to interact with others might scroll these short videos, often without headphones on, while in public. Unless you want your kids to grow up to be those people, teaching them how to handle moments of boredom has to begin right now. Social is good. Constant media is not.