While the acts of the terrorists will forever be seared into my mind, the answer cannot be more of the same. I think I would start with something other than stating that Americans want to kill children in playgrounds. Because humans nature has not and will not change. There is nothing new under the sun.
Humans are the same.
Some are good some are bad. The bad ones look for opportunites to cause trouble. Weakness invites aggression. Strength yields peace. America has long upheld free trade among nations.