I mean, yeah. If someone doesn't like the sight of blood or death, should they work as a doctor in an emergency room? Probably not. Should they work for a software developer that has depended on that kind of thing for many years? Hm.
Why didn't he just say that it wasn't for him and resign?
He probably couldn't find any other work.
You have anything to support that "probably" or is that an assumption on your part? Because if someone is able to get a job working on a big videogame franchise, I'm betting they have a decent resume.