President Obama laid a wreath at Ground Zero today, met with the families of victims and visited with police and firefighters. After Sunday's killing of the mastermind of 9/11, there's the sense of a turning point in the "war on terror," declared after the World Trade towers came down. But almost a decade later, tens of thousands have died in two ongoing wars, and the US is a nation transformed by increased security and stress on the economy. How much of a turning point is it? Did America leaders fail to understand the goals of Osama bin Laden? What's the legacy of a mass murderer? What is the appropriate way to remember what happened at Ground Zero, the Pentagon and Shanksville, Pennsylvania?