About lack of resources.
Perhaps more spending may help,but taking out one or two cell's isn't going to solve the problem.These people are capable of working in close knit groups,indipendent of others and working basically alone.Always another to take the place of one that is caught.I also don't subscribe to the thought's of some that there must be a major nucleus of higher up the ladder nutters ,giving out orders to others.
These people are brainwashed at school and at mosque along with some whom are probably brainwashed and sheltered by family as well.