Martin Shkreli ... gained notoriety in August when, as CEO of Turing Pharmaceuticals, he acquired a drug to treat parasitic infections, especially in pregnant women and AIDS patients, and proceeded to hike the price to from $13.50 to $750 per pill. He resigned from Turing Friday after being arrested on unrelated charges of securities fraud at a hedge fund. Shkreli was no doubt a first-class tool. But to focus exclusively on shaming Shkreli risks missing the larger problem, that the American health care system allows opportunists like him to [exploit] the lack of transparency on how drugs are priced in the United States. His price gouging was perfectly legal and even justified under the market-based system that underpins the health care industry. "There's no law that he has to be ethical," said [Dr. Jeffrey] Lobosky, author of It's Enough To Make You Sick. "His job is not to make drugs available and save patients. His responsibility is to make a profit for his shareholders." On paper, Turing is a drug company, but it more closely resembles a private-equity firm: it buys undervalued assets - older drugs already approved by federal regulators - and makes money by charging more than what it paid. Many firms make drugs that are mere copies of others and offer no real therapeutic value, Lobosky said.