It's not that passengers ignoring emergency evacuation procedures present a danger to themselves, it's the hazard they create for everyone else. Consider the numerous examples where a single obnoxious drunk passenger is physically restrained by the crew, and the flight makes an emergency landing at the nearest airport. The drunk guy is arrested and charged with a federal felony criminal offense for creating a danger to the other passengers on the flight. How is this any different than someone ignoring the instructions they were given during an emergency evacuation?