The default principle—that someone is free to do what he or she desires in the absence of a compelling reason why he or she should not—may make it possible to resolve ethical disputes without recourse to a particular moral framework.
AMA J Ethics. 2015;17(4):289-296. doi:
10.1001/journalofethics.2015.17.4.spec1-1504.
To participate in a lethal injection is to occupy the medical role and use medical training for a purpose that is not part of the goals of medicine and that harms the recipient of treatment.