execution and the medical profession

Truly fascinating. The state of California has indefinitely postponed an execution because they can't find any medical personnel willing to administer the lethal dose of sedative. It's an odd story, like something out of a Coen brothers movie. I just find it interesting because the reason NOT given by the doctors was their Hippocratic oath "first, to do no harm." I mean, you'd think it would've been that pesky oath that got in the way of their ability to execute people. But maybe that's just me.