Jim Harbaugh did act like a child but he was screwed, with the ball on the 5yrd line and the defender all over the receiver 2-3 yards in the end zone a flag should have been thrown. What did the refs need, a ruler, well they had one.
We always see a bit of contact past 5 yards, contact that does not impede the receiver, but if the receiver was a girl she would be pregnant from that play.
In the long run and after it is all said and done, Jim Harbaugh has no one but himself to blame. Do to the fact that the second half was dominated with passing plays and the Defense for Balt had been on the field for most the half, Gore, should have been used to win the game. By that time Gore had been relatively fresh from the high flying second half, he already had about 182 yards on the ground with, I believe, no plays for Negative yardage, pounding the rock in is the obvious choice.
I think most will agree, in the long run Jim Harbaugh has only himself and OC to blame.