I am talking about people who have died, Lighter, and the ideas that justified the behavior that led to their deaths.

And, "Bingo!" you got the answer, or at least close. It isn't the availability of guns alone, it's the idea that it's OK to use those guns when one has a problem with others...

As for the martyrs, kamikazes, and suicide bombers,this article explains how suicide bombers are recruited and indoctrinated in Pakistan--Pakistan's Almost Suicide Bombers It seems that they are neither religious nor political,instead, they are naive and isolated, and have been cajoled to act using fear, intimidation, and brainwashing. One suspects that it has always been like that...