If Dojima hadn't panicked and gone after Namatame like that, would they have had the chance to save Nanako before this happened? Or if Dojima hadn't seen the second letter Souji had gotten? If he could have convinced Dojima of his story? If they hadn't left Nanako alone in the first place.

If if if.

This is getting him no where. The stupid dog is barking again. Souji notices it because of the blaring silence, just after he notices that he's waited way too long for this silence to constitute a natural pause in the conversation.

"...We keep asking them to do something about that."