i am sure there are many cases built on that premise but you would have to search for them; however many of fights have been caused by insulting mothers when a man just loves and respects his mother deeply as well. It is a family pride thing, parentification doesnt have to be involved. the statement of "meant he had to murder" would fall under excuse making for the parentified child as i dont think we even say because somebody is a sociopath meant they had to murder. regardless of somebody's upbringing, murder is a typically a choice.