Terrorism is a scare tactic that has been around for thousands of years. Terrorists technically 'win' when they can change people's behavior based on fear. Even though there has been a lot of fear going on lately, terrorists will never be able to cause systemic change through scare tactics. Society will always come back stronger.
How can the terrorist win, when terrorism isn't a huge problem in the United States? Most "terrorist" attacks happen in other countries, and how can we be sure we aren't being fed propaganda? Yellow journalism was very popular generations ago, who's to say the terrorist are even a threat, when you can't trust the information given to you by your own government.