Following the terrorist attacks in Paris last Friday, many have called for sharper strategies to counter the Islamic State, or ISIS, that has claimed responsibility. According to some observers, the response must be a full-fledged war, with well-orchestrated international cooperation to destroy ISIS and demoralize its supporters. Others suggest that Western powers must reassess their allies, pressure Saudi Arabia to stop propagating its Wahhabi doctrine that sows the seeds of jihadist Islam, and plan carefully when reconfiguring Iraq and Syria after the defeat of ISIS. “Why us?” is a question Parisians have been asking in despair since the attacks left at least 129 dead and 352 seriously injured. “If you are looking for a symbol, Paris is a great symbol just like New York was [during the 9/11 attacks],” said Erwann Michel-Kerjan , executive director of Wharton’s Risk Management and Decision Processes Center .…