Hmm.
If they go for it and miss, Steelers have good field position, and can easily score another FG making it a 2 score game. By taking the 3 points, they can then try and hold PIT to outside the end zone, burn time outs, and have another shot at a TD drive, if they go for it and miss, and dont get a 3 and out, then give up a FG more than likely if they dont keep them to under 30 yards (as suisham has a bit of a leg).
TO be fair im just arguing. Id go for it too every time.