Hippocratic Oath as applied in California

A brutal rapist and murderer escaped execution in California this week because two physicians said their involvement would be a violation of their principles.
“To participate in capital punishment, if you’re a physician, is a violation of the most fundamental ethical principles we hold.” What principles? The Hippocratic Oath says that doctors explicitly abjure “deleterious and mischievous” actions including giving “a woman a pessary to produce abortion.” The Geneva Conventions require doctors to “maintain the utmost respect for human life from the time of conception.” Would that all California doctors held to these principles in all circumstances. Alas, in 2000 alone, 236,060 unborn Californians received fatal treatment from licensed physicians.