To me, JK's backstory and his current self make sense. Sometimes, person comes from humble beginnings would stop at nothing to stand at the very top, even become a trashy human being. JK feels he have to prove, with any means necessary, that he's different from his loser father. Dan, on the other hand, has a loving caretaker - his grandmother - to teach him right and wrong, despite their hard lives.
To me, JK's backstory and his current self make sense. Sometimes, person comes from humble beginnings would stop at nothing to stand at the very top, even become a trashy human being. JK feels he have to prove, with any means necessary, that he's different from his loser father. Dan, on the other hand, has a loving caretaker - his grandmother - to teach him right and wrong, despite their hard lives.