Your entire premise is incorrect. Even with Yondr hundreds of people will be able to call for help. Such as ushers, security, ticket takers, concession workers,

Your entire premise is incorrect. Even with Yondr hundreds of people will be able to call for help. Such as ushers, security, ticket takers, concession workers, event management, etc, etc, etc. Yondr means less (or at least less rapid) social media publicity for a terrorist act, so one could argue that it deters terrorists.