Dear SecretSlaveClass
I agree with you that in many wars there were civilian casualties, and there might have been civilians ALSO who were targeted. In other words, in wars, civilians are also killed.
But a war that is targeting the innocent is what terrorism is, as being practiced now. And in terrorism, defense personnel too may be killed but not as prime target (just as civilians are also killed in the normal war not as prime target).
This is what I said as the marked difference! Casualty may be less than that of world wars, but threat perception the terrorism has created is more than that of all those normal wars. Everyone on the earth lives in fear now. Even the President of the sole Super Power should sleep is determined by them—He needs a no-fly zone above his residence even when he visits other countries). Travel has become extremely difficult even for the former president of the largest democracy in the world. (http://timesofindia.indiatimes.com/india/Former-President-APJ-Abdul-Kalam-frisked-twice-in-US/articleshow/10714158.cms)