If so, then oaths clearly aren't enough. We need to empower doctors to have more ownership over medical decisions.
This goes back to the heart of the issue of capitalism vs socialism: the people who have the actual expertise to do the actual work need to share in ownership over their work so that the work gets done properly. Doctors should be at the helm of the healthcare industry just like engineers should be at the helm of Boeing.
Markets do not equal capitalism. You can have the efficiencies of free markets (worker owned co-ops which are market socialist) without the all consuming greed of capitalism.