Newt responded ONLY after Romney started hitting him with negative (untruthful) ads...and when Newt asked him to pull his punches, Romney made the comment that if Newt couldn't stand the heat, he should get out of the kitchen.
Newt's standing in Iowa was destroyed by Romney's negative and untruthful ads. He could either fight back or drop out.
He chose to stand and fight.
Newt should not have said that just to gain points and neither should any other candidate! No I Newt should not have said that Bain Capital was a Vulture company and how much money they should make. Now if Newt wants to go after Mitt on his record like how many jobs he created and how well he did at the company that is fair game but to just bash Bain Capital. I mean Mitt has so many flip flops Newt could talk about them for a week!