Why are the people crying, Mummy?" a little girl out for a Sunday afternoon cycle with her parents asked, as she passed the crowds gathered on the street corner where the killing began in central Paris during Islamic State's (ISIS) attacks that left at least 129 dead. "They are very sad," her mother said as she tried to navigate the groups standing silently and awkwardly facing the Petit Cambodge restaurant and the Carillon cafe, trying not to look at the patches of bloodstained sand on the pavement where the 14 people who died there fell.