In 2015, Ferguson deplored the Paris attacks committed by Islamic State terrorists, but stated he was not going to "stand" with the French as he argued that France was a lost cause, a declining state faced with an unstoppable Islamic wave that would sweep away everything that tried to oppose it. Ferguson compared the modern European Union to the Western Roman Empire, describing modern Europe as not that different from the world depicted by Edward Gibbon in his book "The Decline and Fall of the Roman Empire". Ferguson wrote that:Uncannily similar processes are destroying the European Union today...Let us be clear about what is happening. Like the Roman Empire in the early fifth century, Europe has allowed its defenses to crumble. As its wealth has grown, so its military prowess has shrunk, along with its self-belief. It has grown decadent in its shopping malls and sports stadiums. At the same time, it has opened its gates to outsiders who have coveted its wealth without renouncing their ancestral faith. Ferguson wrote the mass influx of refugees into Europe from Syria was a modern version of the "Völkerwanderung" when the Huns burst out of Asia and invaded Europe, causing millions of the Germanic peoples to flee into the presumed safety of the Roman Empire, smashing their way in as the Romans attempted unsuccessfully to stop the Germans from entering the empire. Ferguson writes that Gibbon was wrong to claim the Roman Empire collapsed slowly and argues that the view among a growing number of modern scholars is that the collapse of the Roman empire was swift and violent; unforeseeable by Romans of the day, just as the collapse of modern European civilization would likewise be for modern Europeans.