BSM1
What? Me worry?
Well, the oath of a doctor demands that they serve those that need their help when comes to health, which is objective in nature.
To choose who to serve becomes subjective in nature.
The slippery slope you've declared doesn't exist.
Try again...
Doctors and surgeons will treat murderers or suspected murderers that have killed police. It's not a choice. It's part of their job. They might not like it but they do not discriminate because of the power they hold for all other humans.
So... Try again...
Really? Where does it say in the oath that a doctor must help anyone who demands it? And, again, if it came to spending a wasted fifteen minutes with a junkie trying to get a fix or, during that same fifteen minutes, saving the life of someone bleeding to death who do you think the doctor should run to?