Somehow other people have made it such as some from the Royal family. Some people do not live their life in fear.
And other people who have gone to such places have been taken hostage by terrorists.
http://www.nytimes.com/interactive/2014/10/24/world/middleeast/the-fate-of-23-hostages-in-syria.html
It could be called admirable that Angelina goes to such places, but dragging her kids to such places strikes me as risky and unnecessary, especially if their father disagrees.
She can't just do whatever she wants with them against Brad's wishes. Brad has rights too. They aren't just her kids.