Why does the heart always take the blame?

We all know that ‘heart(liver)’ have nothing to do with human’s emotion,psychology,and behavior. It is ‘brain’ that responsible for that. But in reality we all know that many people like to blame ‘heart’ as the one that responsible for human behavior(i.e. like when someone who is strict and careless always called heartless,no heart,etc by other people. As we know ‘heart’ isn’t the right organ that should take the blame.) Why this misconception always happen in human life?,have people lost their point of view in reality?.