I've done commercial moderation before and I would sooner go jobless than go back to exposing myself to the kinds of things people have to when doing this professionally. It's the kind of things you wish there was a brain cleaning solution for, but there isn't so it's stuck there basically forever (though I suspect the alcoholism rate is higher among people who have to handle this kind of thing than in the general population).
The commercial moderation team I was on actually ended up separating out a task force for handling particularly gnarly content so that people had a way of opting out of being exposed to it (in our case we were responding to user reports rather than randomly stumbling on things, so manually filtering reports was feasible), which I think is the responsible approach since there are plenty of other moderation tasks to handle and some people are more or less sensitive to this content.