It would explain why he left Welch so fast and why he never wanted to go back, why he refused to go until his family almost left him, why he drank so much, and why he wouldn’t listen to Jeanette when she was explaining what happened to Brian. I believe that if this didn’t happen when he was younger, he never would have started drinking and he would be able to hold down a job. Rex is a really smart man, and he could have easily gone to college to get a job to support his family. His drinking and his dark past were holding him back. This passage comes from the brief period where he was sober, and you can see the love and compassion he has for Jeanette. All the horrible things Rex has done to his family are results of his addiction. He has deep emotional trauma from the years of Erma’s sexual abuse. If he had seen a therapist to work through the issues he faces from his childhood, he would most like be able to work through his alcoholism as well. If he had sought out treatment, he would be the loving, doting man he is in this passage all of the time. He would have been and better father to his kids and a better wife to Rose