Can Terrorism be morally justified? How and when? Or Why not?

Can Terrorism be morally justified? How and when? Or Why not?
On September 11th 2001, two aeroplanes crashed into the world trade centre in New York, this was the horrifying beginning of what would come to be known 'the age of terror.' Although terrorist acts date back decades, it was this attack on the world's most powerful nation, America, that struck fear into the hearts of the Western people and the potential severity of these attacks was realised. Acts of terrorism are becoming part of everyday news, they are occurring around the world and being carried out by various different group…