Good thing to point out about Deadpool, but you have to consider why he's like that. One he was brainwashed for a long time which makes it harder to come to terms with his past. Two you also have to consider that even he's not considered a hero is what makes him who he is because it shows that even if you have powers, doesn't make you emotionless. Deadpool is supposed to be a reflection on the human reality, in one of the marvel documentaries about him, they make this connection between an internal struggle that exists within human beings. He is the the little voice in the back of your head which will always be limbo and will never stop being in limbo until you reach a state of peace or enlightened joy. Most people think he's this crazy hero who shoots his enemies, buts hes just another person trying to find a purpose and looking for happiness which doesn't exist in common reality. The point is life sucks and thats what he acknowledge so he can find his own path to happiness.