Some religion promises glory in the afterlife for suicide in its cause. Dismissing this as a motivation seems a bit silly.
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is it selfish if it's being done for the glory of god/allah/whatever?
to you they're just words, but to a believer it's much more. The glory's the reason, paradise secondary
Crusades were a RESPONSE to Muslim conquest. The rest don't deserve an answer.
Also all minor in comparison and are no longer threats. All those people are long dead.






