I have some familiarity with people who work with animals. From what I've seen, for most, the nature of what they're doing never really ceases to haunt them to

I have some familiarity with people who work with animals. From what I've seen, for most, the nature of what they're doing never really ceases to haunt them to some extent, however justified or comfortable they feel about it at an abstract level. They just carry on. Something praiseworthy about human nature there I'd say, apart from all the rest of the stuff of course.