With stories like these I feel like people read it without getting the point that the author was trying to make. It's a fuck up story yes and it's meant to make you feel bad for the mc. He was abandoned as a child adopted by a good for nothing alcoholic and now he is getting attached to his captor. That is point. it's a sick twisted story, it's not glorifying the ML behaviour or showing him in a good light. Mc has never gotten a chance to have good healthy relationships or have a guardian to protect and take care of him that's the plot basically.