One of the greatest mysteries I had to help with was about a boy who was too rough with everybody and couldn’t understand why other children cried from that roughness.
Then his mother told me that he had a broken arm, but he didn’t tell her till after three days of falling of his bike that his arm was a little bit sore!
He is one of a group of people whose part of the brain that senses the feeling of pain, was barely present. Because he felt little pain, he presumed others would feel just as little.