So as long as we aren't losing, we should always kneel out the first half when we have the opportunity? The probability of turnover or pick-6/scoop-and-score doesn't change based on whether there's 30 or 60 or 120 seconds left. That's what you're advocating. The fact that a scoop-and-score happened randomly later in the game has no bearing on what our end of half strategy should be, other than to cause people to be unnecessarily conservative.
Since you're big on probabilities, what is the probability that the offense on the field last night was going to drive 80 yards in 50 seconds when they had only gained a total of 76 yards through the entire half up that point?
My best guess here is that Campbell had no confidence in getting a score there. Obviously the flow of the game and performance of the offense up to that point is really the deciding factor here for the coaching staff. If the offense had been rolling he probably would have taken a couple of shots to see if we could break something loose. I'm absolutely all for being aggressive at the end of the half if it makes sense based on how the game has gone and the confidence level in not messing up and making things worse.