Terrorsim is the use of violence and threats to intimidate or coerce, especially for political purposes.
Terrorist don't care if they kill or hurt people, I don't know how they can do this terrible act without torturing themselves in their mind.
Nowadays we are really aware of the pain of terrorism and also of the consequences that it has. What do we against terrorism? In USA they promote the war, and it's a little bit ironic because if you don't want violence don't do it.
I know that sometimes is very difficult don't want to make them feel the pain that they they're doing to us, but we're more civilized and we can condemn they to the jail.