Manchester attack was a masterpiece
Whoever organised it is a true genius and we should give him, her, them credit for that. It was a despicable murderous attack but it was carried out with absolute efficiency. We shouldn't underestimate the people we are standing against. They have the brainpower to organise this kinds of attacks for maximum effect.
It was a low-cost operation, requiring not so much technical expertise and requiring limited manpower that minimised loss of human resources, therefore making it practicably undetectable. The Security Services due to lack of manpower usually focus on operations requiring big amounts of money, technical expertise and manpower because this is what usually allows early detection. They Security Services are not equipped to deal with operations like the Manchester operation.
Islamic State quickly make sure that it quickly capitalise on the political repercussions and it must have been a huge morale boost for its embattled troops in Iraq and in Syria.
These people are not cowards, they are not crazy and they are extremely intelligent. They know exactly what they are doing. The aftermath of the Manchester attack and the fact that alert levels have now been raised to Critical with the deployment of the army is certainly a huge success for Islamic State.