Rafe nails it over on rc3.org:

If you ask me, there's nothing more unsettling than the idea that some person believes that blowing up others is so important that they willingly give their life in the process, and indeed, by design. That's a sort of nihilism and fervor that I'm not really prepared to deal with psychologically.

There are a lot of other things about this whole Israel/Palestinian war that I don't comprehend, but this has to be one of the hardest to fathom.