It was destiny. Because, it's interesting to note how close the Steelers were to not even making the playoffs.
On November 13, the Kansas City Chiefs (5-3 then, 10-6 at season's end) put in what proved to be their worst performance of the season. At home (Arrowhead Stadium), the Chiefs lost 14-3 to the hapless Buffalo Bills (3-5, 5-11).
If that game had turned out as it "should" have, the Steelers (11-5) would have been at home watching the playoffs and Super Bowl XL.
It seems the Steelers were destined to win one for the thumb.
Mike Ditka said that the Steelers won those three playoff games away from home, were on a role, were a team of destiny and would win the Super Bowl.
Turned out he was right. The Steelers were an irrestable force.