Unless they're under military law, no one is requiring them to stay at their jobs under duress, or to engage in activities they see as abhorrent as part of their work.

"Give him a break, he's just doing his job" doesn't fly when the job involves doing things that are WRONG. Not for cops, soldiers, jailers, corporate middle managers, or hangmen.

Choose to be an executioner? F--k you. Hope you have nightmares every f--king night of the rest of your life. Maybe you'll actually do some good when you come out against the death penalty, as a lot of former executioners did.