Gingrich is dealing with peoples' perceptions based on their observance of what has been happening on Wall Street the past few years. Of course, the MSM likes to pile on Wall Street, and never seems to mention the other party to their transactions; politicians in Washington DC.
People need to be reminded that it's Crony Capitalism that skews the benefits the regular person might derive from a more ethical capitalist system. I believe this is what Newt is trying to say with his comments.
There is nothing ethical or unethical about a capitalist system.
It is the people within that system whom are either ethical or unethical.
An economic system CANNOT make choices between right and wrong or moral and immoral.