A thing I quite like about this film, beside all the...everything, obviously, is that this is one of the only films where they show WHY the main character is so self sacrificing for his friends.

Now don't get me wrong, obviously I don't NEED an explanation for that. But Shaun's life is in such a dead end, it makes sense for him to be willing to kill himself protecting people who's lives "have worth". Like was directly said to you: the good things are worth fighting for.