We now know that the assault on Charlie Hebdo was the outcome of intra-Wahhabi rivalry. The attack has been claimed by Ayman al-Zawahiri as an al-Qaida initiative, organised by its section in the Yemen. There is no reason to doubt his assertion. His organisation has been outflanked and partially displaced by the Islamic State and a global act of terror was needed to restore its place as the leading terror group. As in other suicide-terrorism outings by al-Qaida, the act itself was well planned and predictably successful, and those who carried it out were duly sacrificed. Al-Qaida’s supporters will now boast that while their rivals kill other Muslims and accept Western largesse, they alone target the West and inflict damage. The fact that all these acts are inimical to the interests of European or American Muslims and benefit only the West seems to escape their attention. David Cameron and other Western leaders insist, as they do after every outrage, that the problem is radicalised Islam and therefore the responsibility lies within the religion. (Why was Catholicism never blamed for the IRA offensives?) The real problem is not a secret: Western intelligence services regularly tell their leaders that the radicalisation of a tiny sliver of young Muslims (more work for the security services in Britain and France than for al-Qaida or ISIS) is a result of US foreign policy over the last decade and a half. Some of these Muslims have been happy to acquire new skills and priorities while fighting in Bosnia and, more recently, Syria.