The female attorney in "Man on Death Row" said that at one time Booth was a pretty angry guy. I have a feeling that we're going to find out that before Parker was born Booth had a lot of problems with PTSD, gambling, anger, etc., and that he cleaned up his act because he was afraid that he would not be able to have access to his son if he didn't. And also, maybe having his son made him want to be a better person for him. That's my take on the bits and pieces we know about Booth's past from comments that he and others have made.
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