Quoting wiki:

Terrorism in the modern sense[1] is violence or other harmful acts committed (or threatened) against civilians for political or other ideological goals.

That is the definition of terrorism - that terrorists are not globally the same people for everyone is the same as with that not everybody that is your friend is also a friend of everybody else. Same goes to enemies, criminals and so on. Just because you do a crime in one country does not mean that you are a criminal in another one. Those words are of course bound to the political directions of a country / government. Just because you are a sinner in christianity does not mean that you are a sinner for jews/muslims, etc...

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well i think terrorism originates from terror, a "pleasant" way of ruling over people, since terrorist usually don't target civilians just because they are civilians, but because targeting civilians is meant to put pressure on the government, religion or whatever.

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meh, shame such a great topic is left in dust :(

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There's a group of people who are trying to defends their religious with the violent, and to attack those who are against their religious, and basically, people would think that it is causes by the differences of culture. But most of the time, this kind of people were actually used by some forces for political purpose. And today, with the help of globalization, terrorism has been spread around easily and widely. And the battle for the anti-terrorism is become tougher.

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