That's why I put it down as "theological/ideological arguments". I agree the line between the two is blurry. There are two broad strains of fundamentalism - one that is ultra-conservative and one that is radical. Radical fundamentalism tends to diverge a lot from the established theological schools, even those that are traditionally more militant. I believe Al Qaeda is of the radical strain, while the Taliban is of the ultra-conservative strain. I'm not surprised at all that they disagree except in the face of a mutual enemy. Same as the Iranian Revolutionary Guard vs. the Ayatollahs and the Guardian Council. That's what I learned anyway. I also think that there's a difference between people who are simply swept along with a mass movement or with the weight of tradition and people who are active advocates and fighters. I admit I often personally lump the former together with the latter due to how much I disagree with both. But they're different, and the reason(s) they have are different.