The motives for some of these extremist groups sometimes escape us. I gather that, as it's been for centuries, sometimes it's easier to campaign on hate than on ideas of how to bring your country forward. Certainly it's easy to just campaign on religious purity, making Indonesia religiously pure again, and things like that. It's very easy to campaign on that as a group, versus campaigning on more complex issues, like how to build a better health care system, or whatever.
On November 29th, 2012. See this statement in context.