[Well, he's glad she's calming down a little, at least. Her argument is not particularly convincing--if he weren't here he'd be bleeding to death on the ground in a parking garage, so Hadriel is not exactly a terrible alternative--but he'll just ignore that part entirely for now.]

Let's assume it isn't hypothetical, because although particular individuals and events affected are, you're right in that the scenario as a whole is not. It will, very likely, happen.

[He doesn't mind making that concession, because ultimately it doesn't matter.]

Even then, can you really say that however many people are here should just let themselves die? And even if so, and you don't care about them individually, what about how that'd affect their worlds? If someone dies here permanently, do that means they never go back to their worlds? What happens to the world they came from then; do they disappear? Are they erased from existence? Is there a ripple effect of harm that there might not have been otherwise?