Apparently every doctor on the planet will die within thirty seconds of a SHTF event.
There just happens to be a bajillion different kinds of SHTF.
Massive power outage during a blizzard
Hurricane Katrina like storm
Active shooter situation
Gigli 2 movie premier
The Great Depression Part II
Limited nuclear exchange
Cold War type nuclear exchange
Now a few of those SHTF situations will never return to normal, but the majority of the situations are either localized in their destruction or only SHTF for a limited period of time. Assuming you should kill members of your family/party because of a severe wound and they'll be slowing you down is... unnerving to say the least.
Hell a lot of the time it's better to stay put than to go anywhere.
Learning basic and advanced first aid can be the difference between life and death. Assuming someone will die so you should just end it for them is sociopath. People can survive a lot more than the movies lead us to believe.