A proper discussion about terrorism is the best way to honour Manchester’s dead

Until last week, it was thought that the jihadi threat was subsiding and the security services were increasingly able to disrupt any serious plot. The recent attacks involved knives or rented cars – deadly in the wrong hands but a far cry from the 7/7 attacks, or the seven-aircraft Heathrow aircraft bomb plot thwarted in 2006.

Yet now, for the second time in our history, a suicide bomb attack has been perpetrated against the public. And this might show that things are getting worse. That as Isis is forced into retreat in Iraq and Syria, the jihadists are preparing to return to Britain with deadlier skills and tactics. While al-Qaeda focused on military and economic targets, Isis considers young girls at a pop concert to be ‘crusaders’. The terrorist threat seems to be evolving yet again.

As the threat adapts, so should our response. No politician will want to do anything which might be interpreted as trying to exploit the Manchester attacks – yet security is a valid issue in this and every other election.