Finn frowned for two reasons. First, he didn't see how that really proved anything. Second-... Why was Poe so hurt suddenly? What had he said?

He went with the first problem, shaking his head again but in misunderstanding this time. "We had no choice. Yeah, I... mostly went there to get Rey because I didn't believe at the time that we had a hope in hell of... doing exactly what we did today. But we had to stop Starkiller. There wasn't a choice. It was the only decision."

The Force certainly didn't tell him to stop the planet-destroying weapon. He could figure that out on his own, thanks.