There is no 100% effective security against fanatical and suicidal terrorists without bringing day-to-day life as we know it to a grinding halt. Israel must arguably be one of the most "secure" countries in the world. Yet they still suffer attacks from suicide bombers.
September 11th has been done. They will move on to other scenarios. A suicide bomber can strike anywhere at any time and is hard to stop. Yes we must have security but some of the steps taken since 11/SEP are indeed a complete farce!