Trump is backing off because his poll numbers are dropping. People don’t like his antics. He is being advised to act like an adult because people are realizing that Carson kerfuffle is not Cruz’s fault. Cruz is such a good guy that he apologized anyway. Don’t forget Trump was polling ahead of everybody in Iowa but the polls were wrong weren’t they? The polls are wrong everywhere...
So you are saying the polls could not be wrong in Iowa, so Cruz pulled out a win by cheating.