Misallocation of police resources and a failure to touch the social issues behind terrorism at all, are the obvious culprits. To my mind 3,000 possible troublemakers can be watched closely but you can't do it with 18th C policing techniques and by continuing what appear to be overtime grabs when nearly ten times as more officers show up at accident scenes than are needed. Most of these officers need to be 'following' the troublemakers, using 21st C. investigative techniques.