Years ago I worked in IT policy enforcement. My job was to review what employees were doing on the internet that fell outside of what was permitted. We had automated systems that did most of the work but I was responsible for looking at exceptions. I would occasionally send my wife a note telling her that I was coming through to my home office and that no one should talk to me. I would retreat to my office and emerge when I had calmed down enough to interact with people.
My boss told me when I started in the role that it was only possible to do it for so long before you needed to stop. He told me that I could raise my hand at any point and say, "I can't do this anymore." and he would take me off.
I worked in corrections. The people I was watching were staff who worked directly with the offenders. I saw some truly fucked up stuff.