It's sad, really. How life can cruelly take away your chance to be somebody important or meaningful, or how it can take every decision you make and turn it into an incompetent one without you knowing, and then punish you for it. Ben's character was tragic that way, in which his fight against his fate of being nothing but an unhelpful loser simply led him to a meaningless death. Perhaps he stayed to defend Clementine when she was being attacked. Then he would have gotten eaten and Clem would have still been in trouble, and still needed to be rescued by Chuck. Perhaps he didn't make a deal with the bandits. At a much sooner point they would have attacked the camp and killed Carly, Duck, Katjaa, and then Ben, making his decision pointless.
Fate has a funny way of getting what it wants, when it wants it. And fate wanted Ben and his decisions to be pointless. Such is life.