My (limited, so please correct me if I’m saying something dumb) understanding here too is some people are just wired different and can handle more traumatic situations than others.

My therapist had me read a book called The Highly Sensitive Person by Dr. Elaine Aron after I told him I was struggling with things I felt a “normal” person should be able to handle just fine. The book made a lot of interesting points about what it means to be sensitive (broad sense of the word) to the world around us.