The people become bitter due kind of abuses, neglect, etc., not incurable illness. This is a difference.
I disagree - I have suffered a great deal with neglect but I am not bitter.
You have seen so many children who were spoiled and pampered yet many of them grew up bitter.
I think it all boils down to their attitude. We DO have a choice in whether we want to be positive or not.
Look at Jilio above mentioned - perfect example...Im in awe of her spirit!