Chapter 8: What does Cherry say was one of the big causes of Bob's problems?

Cherry said that one of the big causes of Bob's problems was alcohol.

But when he got drunk... it was that part of him that beat up Johnny. I knew it was Bob when you told me the story. He was so proud of his rings. Why do people sell liquor to boys? Why? I know there's a law against it, but kids get it anyway.