Answer:
Terrorism used to bring about change happens because something is going against their beliefs.
Step-by-step explanation:
The cause could be because something detrimental happened to the person or the people around them. They may live in a society where they can't or not allowed to do something so they resort to some sort of violence to spark change.
Another cause would be because they are a group of people with a strong set of beliefs and will resort to terrorism if it means change will happen.