JP Morgan’s $2 billion trading loss on fueled renewed calls for greater oversight of Wall Street banks Friday, and the industry rushed to stem criticism that they were right back to their arrogant, risky ways so soon after the financial crisis and government bailouts for high-flying financial institutions. There is no public bailout at hand in this instance, and JP Morgan is still expected to make a large profit in the second quarter, even as it warned of potential future losses. But the event has sparked new fears about the risks big banks are taking. Indeed, the losses JP Morgan revealed this week were based on the same complex instruments that were central to the last crisis - credit derivatives.