The stereotypical image of a terrorist is usually a muslim, but terrorists are everywhere. They're people who are willing to act on violent ideas. Racist US cops, bullied kids who shoot up their high school (making bullies indirect causes of "terrorists"). Everyone has their breaking point and some are more naturally inclined to solve their problems with violence, causing death to the innocent. Education, culture and surrounding plays a huge part in this. Terrorists are simply products of their environment.
I bet there`s a difference between terrorists and people having breaking point. Terrorist is someone using violence and intimidation aimed at common civilians to pursuit his political agenda.
Thus, terrorism is not limited to muslims - someone mentioned Breivik in neighboring topic. He is a true terrorist, he even had a 1500 page manifesto describing his standpoint.
But still, is the person at the breaking point causing much damage and terror shouldn't be called a terrorist? Does the cause justify the means?