You're looking at the suicide bombers from a western point of view. You have to look at it from a broader cultural, historical, and military perspective.

Thousands of Japanese airmen deliberately dove their bomb-laden airplanes at Allied ships in WWII. That was hardly a call for help. Hundreds of thousands of Japanese soldiers died in furious Bonzai charges that were literal suicide. That was hardly a call for help. Japanese sailors drove Kaiten torpedoes or bomb-laden speedboats at enemy ships. That was hardly a call for help.

On Attu, Saipan, and Okinawa, hundreds of people (men, women, and children) dove off of cliffs rather than be captured by American forces. I've seen films of Japanese women throwing themselves and their children off the cliffs to their deaths. If you look at maps of these islands, you'll see "Suicide Cliffs" or "Suicide Bluffs." That was an act of desperation but hardly a call for help.

In later wars, Korean and Chinese troops attacked in mass "human wave" attacks against UN positions in an attempt to overwhelm with sheer numbers. For most, it was a form of suicide. In the Vietnam War, many VC killed themselves to kill American GIs. That was hardly a call for help. The Tamil Tigers on Sri Lanka have used suicide bombers since the 1980s to kill their enemies. That is hardly a call for help.

Suicide bombs are a desperate weapon but all too often an effective one. Ask any security force personnel like the Secret Service and they'll tell you that it's difficult to stop someone who isn't afraid to die. The Kamikazes of WWII were the result of a pragmatic decision - the chances of surviving an attack on a warship were very low anyway and going all of the way into the target increased your chances of a hit. The same is true for the suicide truck bombers used in Lebanon back in the 1980s or the people who strap on explosives today. They don't see their deaths as a call for help at all. Instead, they see their deaths as the most effective means of killing their enemies. Under the circumstances, they're probably right.