How do you explain that a person without any social or political grievances decide to abandon their computer science degree to fight for an Islamic state? [1]

How do you explain that a person without any social or political grievances decide to abandon their computer science degree to fight for an Islamic state? [1] [1] Jihadi John: http://blogs.reuters.com/great-debate/2015/02/27/the-horror-of-jihadi-john-and-the-jihadi-janes-coming-to-join-him/ http://blogs.reuters.com/great-debate/2015/02/27/the-horror-...