Yeah, and if Anima never showed up they wouldn't be in that situation at all. Or if HE hadn't wanted to go to Bodhum they wouldn't be there. Or if he hadn't slept in they might have left Bodhum sooner (I'm making that up), how far back do we want to extend indirect blame. AND, PSICOM would have just mowed them all down eventually anyway.
Lightning didn't say it was an understandable reaction, she (again, the ONLY ONE) told him that Snow didn't kill Nora, and that he'd be better off focusing his anger on staying alive and against Sanctum. Now, I'm rusty on my memory of the scene, what was her indication that it "didn't stick?"