Khalid Masood was a convert with a criminal past. So far, so familiar

Attackers inspired by Islamic extremism have rarely lived puritanical lives, but one surprising thing about Masood was his age

So we now know that Khalid Masood, the 52-year-old Briton who carried out the Westminster attack in London, had a string of criminal convictions. His first was in 1983 for criminal damage and his last was in 2003 for a stabbing. He was also a convert to Islam. Neither fact should come as a surprise.

Attackers apparently inspired by Islamic extremist ideologies are, for all their righteous rage at others, rarely particularly puritanical in their personal lives. A man who earlier this month seized an automatic weapon from a police officer at Orly airport in Paris had traces of cocaine in his blood and a long criminal record, while the attacker who killed 86 in Nice last July had a history of heavy drinking, cannabis use and casual sex. Several key members of the network which killed 140 in Paris in November 2015 had been involved in drug and arms sales. Almost every high profile attack in Europe - and many in the UK - in recent years has involved someone convicted for petty or serious crime.