"is not taking anothers life because you feel it is right to do so"

Oh yes it is.... you assume that it's RIGHT that someone else live so you kill something so that they can....

You assume it's better that YOU live, so you kill things and eat them

At least a doctor has training and can better know a persons chances of survival and estimate what their quality of life might be should they survive....

" if family members were available"
Cause untrained family members have a better grasp on things than a trained professional?