No, in all possiblity no. But we can do something productive, to show that we can still pull together. There's very little we can do to prevent these attacks short of being a lock-down society. Don't tell me everything has changed forever, because we can't tell what's going to happen yet. One more thing, stop calling these terrorist events evil .
Evil is a totally debased term.
I don't know. Incomprehensible might be a better word. Word evil, I hereby banish you from the English language. Well, after tragedy, many things still go on. Like my roommate fucking like a crazy rabbit.