He was attacking unethical, ruthless and immoral behavior by Romney. Such attacks are no more an attack on capitalism than attacks on abortionists are an attack on the medical profession.
Yeah, I saw that silly quote endlessly as well. Unfortunately Newt chose to use an absurd, lie-filled pseudo-documentary worthy of Michael Moore. It was so rapidly debunked that Newt was asking its producers to make major changes within days of posting it.