I'm a bit ...skeptical?... about all doctors and all nurses refusing to assist in executions. I mean, that speaks well of them, and it's decent of them, sure. It speaks to their sensibilities, and their incorruptible nature, and their integrity, and their respect for life. Which is why I find it odd. Because, while absolutely, healing is without doubt a noble profession, and many/most doctors do do their best, sure; but doctors of questionable character, ranging from the willing-to-cut-corners all the way to greedy-amoral-complete-scumbag-lowlife, isn't exactly unheard of. I don't know about how it actually is, but speaking generally, I find it surprising that despite paying good money they don't find doctors willing to do this thing. Maybe they're not paying good money? If that's the case, then it's easily remedied.
(Not saying a doctor willing to double up as executioner, or maybe specialize as executioner, makes them a scumbag. Just, I find it hard to believe that all doctors, without exception, are so hung up on the ethical aspect of it.)