This won't be fixed in a hurry, the government can't wave it's magic want and everything will be alright. Even if all those policemen were replaced tomorrow, it would not prevent further attacks. For whatever reason, the UK and France are the favourite targets for islamic terrorists outside the Muslim world itself which has it far, far worse! The reasons why some countries are targeted so much have to be understood before there will be any hope of long term improvement and the remedial actions will take a while to have effect.