Obviously there are differing views on this, but is it that pathological to see absolutely nothing wrong with a consenting adult making an informed decision to place their own life at peril? Most of my concerns would be regarding a malfunction or the triggering device not operating as advertised. But if it actual works as labeled then who am I to judge.
NYC banned carrying a pocket knife for the exact same reasons. An adult cannot carry a knife to protect themselves, just in case they might cause harm to themselves, nevermind protecting themselves from criminals running around unchallenged in NYC.
Because unlike the Nervegear people would actually know what they are getting themselves into and would understand the consequences ahead of time.