I don’t disagree with you entirely but there are some areas that do have defined societal rules where life saving is not the legal obligation. Now, this varies by state (some have samaritan laws) but many places you are not under a legal obligation to administer life saving aid. For example, providing CPR in areas considered medical backcountry.

I think it’s already a mixed bag and the default position is not “protect/rescue human life in all cases” legally. Morally I would say it’s a personal decision, I know I would most of the time in scenarios I can think of but obviously there are scenarios I can’t think of.

My point is it’s already murky and there are already exceptions.

Edit: actually the more that I think about it the more exceptions I can find your thesis. The first thing they teach you in First Aid/Cpr and the reason my entire class failed and we had to redo a 10 minute exercise to pass is that the #1 priority is your own safety. You have to secure the scene. If saving someone requires endangering yourself you are CLEARLY and unambiguously told to not attempt life saving aid until you can minimize or eliminate risks to yourself. Also see: Yellowstone hotspring rescue attempts, river rescue attempts, etc.

So again, nothing is clear and human life is not to be protected as a rule in “all” cases. EMS and police are not even obligated to save anyone in all cases.