Romney also refused to attack Obama - his radical past, Benghazi . Romney is a gentlemen but you can't be a gentlemen when you are running against one of the most corrupt politicians in history. He needed to play dirty and call Obama out for what he is - a Socialist at a minimum, and more likely than not, a Communist. He needed to call the media out.
He thought he could win the election solely because of the economy -- that obviously was not enough. He needed to scare people -- like O's fearmongering -- but Romney's scare tactics would have been warranted.