
This may sound harsh, but I don't like how weak Kirino is. He pretends to be strong, but he actually isn't.
He's just not able to carry the consequences of his decisions, so he tries to be at ease with everyone and don't decides anything.
He's just pitiful.

Well, why not try to think about it from another point of view: what if Kirino's decision was to have less regrets? It seems that no matter what choice he made, he'd have regrets no matter what. He probably took his time to realize what regrets would be bearable, and what regrets would be devastating. Perhaps after some consideration Kirino came to a conclusion that he didn't need a pyrrhic victory. At first, Kirino's story left a feeling of suffocation, but when I gave it a second thought, it occurred to me that sometimes it takes more courage to acknowledge one's own limit, and face it, and accept it (which seems to be Kirino's case).
wait, what did just happen? I need a spoon of cinnamon. RIGHT NOW.