Colin Freeman: Isil wanted to inspire an uprising of lone wolves - but its bubble is bursting
This may not seem like a good time to argue that Isil's terror campaign in the West has been a failure.
As of yesterday, 34 people were dead and hundreds more injured after Tuesday's bombs in Brussels, and there are fears that more terrorists are about to strike. The Belgian capital's authorities, meanwhile, have advised the world to avoid "non-essential travel" to their city, a level of caution normally only applied to places such as Baghdad.
Yet if we consider the situation in perspective - something I accept may be hard if you were in Brussels airport on Tuesday - many of the signs are that Isil's campaign to bring slaughter to Europe is already on the wane.