I didnt find Billy the Kid to be especially sympathetic..
I know little to nothing about the actual Billy the Kid, but the way he was portrayed in this movie did not really make me feel much sympathy for his character like I feel I was supposed to. He does murder a lot of people, not all themselves evil or despicable. He shoots deputy Bell in the back, and then goes out of his way to mercilessly kill the other deputy with his own shotgun, as if he had found some ironic inspiration in doing so. Most of the time, we are told that he is great and awesome, but are rarely shown what would make him such a idolized figure. He sure does sit around a lot, though.
I get the impression that I was meant to like Billy the Kid and feel sorry for him as he got killed by the end of the movie, and yet I did not feel so. Maybe it's because I dont know the history behind his character, or maybe there's an angle to his character that I didnt get.