In the final chapter of the book, Friedman reminded us that the new flat world is being used for good (to help improve quality of life and grow the economy), but also sometimes for evil (terrorism). It's important for us to fight the people that are using "the flatteners" for evil.
The Berlin Wall crumbled on 11/9/89 which signaled the start of a new revolution of freedom and when technology began to go into hyperdrive. However, when Bin Laden orchestrated the attack on 9/11/01 it was almost a setback for the "flattening" of the world. Everyone was afraid and realized that maybe we were "flatenning" too much and technology was now available to everyone.
I feel that with anything, some people are going to be use it for good and some for evil. However, I don't think that should make us want to slow down on innovation or technology. Maybe just be cautious.