And you now know why some groups (religions, sects, etc.) use (or have used) martyrdom (including the suicide bomb variety) as a tactic, and others have not:

More than one goal exists for each group, many of these goals are not mutually compatible, and different groups arrive at different mixes of tactics in pursuit of their goals and to resolve (or ignore) the various contradictions and incompatibilities in different ways, and these mixes change over time in reaction to a changing environment, including the S&T employed by other groups.

IOW, don't expect the strategies or tactics that groups use to settle on any sort of Nash equilibrium.