Overview: Tackling the "broken society" is back on the agenda following last week's riots. David Grossman reports tonight as Cameron and Miliband draw battle lines, and we'll be joined by David Willetts and Hilary Benn. Paul Mason considers the degree to which gangs can be blamed for the unrest. Madeleine Morris visits Berlin to ask how heavy a price the Germans are prepared to pay to save the euro - we hear from their Foreign Minister Guido Westerwelle and will be joined by economist Joseph Stiglitz. And was Peter Oborne right when he wrote that the moral decay of our society is as bad at the top as it is at the bottom? We'll debate.