Originally Posted by Unregistered

You are not very good at understanding human emotions. Are you an engineer?

hahahaha is not always a sign of laughing happily. It can also imply a deep emotion where the human is under a lot of stress and hopelessness and he will just laugh out his misery. In fact, it is good that he has laughed it out, or else the next stage would be a deep depression that can lead to giving up his life.