Voldemort's new recruitment tactics are... interesting, to say the least. But quite effective.
Something stopped Voldemort that night. But what if it wasn't Harry Potter's secret superpower, Love, or Lily's magical rune circle/blood ritual/sacrificial spell/etc? What if it was simply, as McGonagall would put it, "sheer dumb luck" - and a certain Dark Lord's tendency for gloating. Oh, well, at least he didn't monologue. I mean, who monologues in front of a baby?