|What IS wants, in a picture|
It was not, as some have tried to maintain against all logic, that the West intervened in Libya and provoked a reaction against it. It was self-evidently that it did not intervene enough. In timidly restricting itself to a no-fly zone, it did not remotely attempt to help set up a functioning democratic state in the aftermath or prevent a power vacuum being filled by jihadists. In fact, NATO left early, against the wishes of the new government.
It is by now painfully obvious that wherever there is unrest in the Muslim world, jihadists will not be slow in moving in. The trick is not to let them get established. Proactive, not reactive; a stitch in time.