Your example of narcan doesn't even make sense - no one has to die for there to be more narcan. They just make more. So yeah, obviously we should give people narcan even if they're making bad choices. People dying of lung cancer or liver disease require someone to die (or at least permanently give up part of an essential organ, in the case of livers), and we can't just go to the pharmacy and pick up some spare organs just in case. It's part of the deal that you don't get an organ if you don't meet a whole bunch of criteria, like being sober, getting vaccines, generally doing as much as possible to ensure the success of the transplant, because there's someone else who will. Maybe they can't change the past behavior that got them in the situation, but choosing not to change current/future behavior is absolutely grounds for denial.