I can't think of anyone I admire who isn't fuelled by self-doubt. It's an essential ingredient. It's the grit in the oyster.
I think that if there are positions that you can't argue... then the responsibility is probably to resign. If one's own conscience is opposed to the requirements and responsibilities of the job, then it's time to leave the job.
It is always incorrect to assume you can know what someone's moral convictions are based on their philosophical theories.

