I look at this is a different way when measuring "taking care of the ball."
If we were more aggresive with our passing attack (not only would it open up our running game to even more success) but it would allow us to put alot more points on the scoreboard, especially against better teams.
Now, would being more aggresive in the passing game open us up to more INTs? Sure. But which is better? Throwing no INTs but not being able to move the ball, make first downs and score points? OR, scoring a bunch more points, using the incredible athletes all around you to do so, but occasionally turning over the ball? If we score 2 tds for every 1 int, with our great defense, we'll win every game we play!
CNS's aversion to TO's and therefore playing too safe may be his achilles heel in these big games.