I think the 9/11 attacks pretty much quashed the have/have-not theory. All of the terrorists involved in those attacks were pretty well healed, as, of course, was their financier.
I suppose it could be argued that they fought on behalf of the have-nots, but I think that is doubtful. Rather, I think it is rabid fanaticism, pure and simple, whether it is religious or political. The interesting part is the suicide bombers themselves, who have no opportunity to see whether or not their terrorism achieves the desired results, unless they believe in immediate afterlife or reincarnation. I cannot understand the motivation behind such actions. Most religions forbid killing innocents, and committing suicide, so the religious aspect seems lost on me. Similarly, if the goal is worldly, then removing oneself from the world seems contraproductive to the purpose of effecting change.
Martyrdom is recognized in many religions as a high ideal, but that applies to martyrdom at the hands of others, not by your own. To "lay down one's life for others" is similarly a high calling, but is generally applies to exchanging ones death for the death of another, not killing oneself in the process of killing innocents who pose no immediate threat to your own or anyone elses life.
I'm at a loss to explain it.
Quod scripsi, scripsi.