The way that I see that life is worth living for is to go after those things that are just almost impossible to achieve and high in idealism. Even if it's just constant failure and feelings of getting hurt and even possibly getting yourself killed by another turned enemy, I think there some things that are just worth sacrificing personal life over. For instance, a parent dying for his or her own child is considered to be a very natural act of sacrifice; it's just ignored quite a bit until a person actually gets to be in that situation and then just those realizations come into play to be able to make a selfless decision.
Regardless of how others think sometimes, the self is pretty much considered to be the best at determining what's the greatest thing in life. I see it if a person is just so built up with frustration and can't get rid of it and just has to express it in a form to try to let it go or influence something to make him or herself feel better, then might as well be ready to sacrifice everything while sticking to a very selfless agenda. Even though feelings may think otherwise, I think it's possible for anyone to still suck it up and make a selfless act that is very powerful and something to look up to while making the ailing person happy! I just see it less often done in women for some reason because I believe that an average women might have a very difficult time coping with some perturbing emotions because it just feels so physical and debilitating. My mom told me that men and women have different brain chemistry, so it could be an influential factor in why they both think so differently.