> Even if they believe in the death penalty the risk to their careers seems not worth the non-existent reward.
I would presume they pay fairly handsomely, if there are few doctors willing to participate. Even if they payed them $10,000 to do it, there aren't enough executions a year for it to dent the budget. I wonder if that info is public.
(Personally, I find the death sentence in any form barbaric, given how it nullifies any form of recourse in cases of wrongful conviction. It might however be an agreeable option to offer "voluntary execution" of some form: allow inmates convicted for life an alternative to using bedsheets in ways they weren't intended for. What a depressing topic, this.)
In the chair you are looking at a minimum of about 90 seconds of agony, which some taking in excess of 10 minutes.
https://en.wikipedia.org/wiki/Hypercapnic_alarm_response
Inert gas asphyxiation would be a more "humane" way