I think the lack of choice, or at least absence of a right or wrong choice, was intentional. You CAN choose to shoot, or who to shoot, or where to shoot, but the outcomes are always lose-lose for Walker and his men. Which I really liked. I didn't buy this thinking there was a karma system or Mass Effect like freedom.It was a nice touch that when Lugo dies you can either kill the mob or shoot into the air to clear them out. That felt like an organic choice to make in that situation which was both intense and realistic.