Outside of their profession, doctors are just people like anyone else. But within their profession they have to understand the concept of triage, operating sometimes for the greater good.

One can deflect a debate by delving into the root meaning of words. But this is just a show of knowledge. What counts is what people understand by words now.
As a rule, selfishness is reprehensible. Altruism is something humanists aspire to. Without altruism we become selfish savages.