And frankly, you're wrong. It doesn't matter if Kenny kills Larry. The choice was never about if he dies or not. It was about if you would do it. That's the choice. That's the branch. If TTG did anything with this series it was to ask the player a series of questions. It wasn't to create a branching plot, and if you think that then I can't really help that. You're wrong.
So, things are sometimes out of the players hands in TWD? Things are often out of my hands in general. What matters is how you deal with that. This is not a game about being Captain Space Hero determining the fate of the Galaxy. This is a game about being caught in a shit situation and coping with that, perhaps retaining some humanity in the process, even if others don't.