Although, if we are going to talk the Japanese, we should note the complete difference between Japanese suicide and Islamofacist Terrorist suicide.
The Japanese did revere life. They were in no rush to death. They did not want to sacrifice more than was a necessary. When they did suicide, it was a ritual for honor... but suicide is not what got them a place anywhere in the afterlife, just in the current one. They also only targeted military opponents in a war... not civilians. It was derived from being on the losing side of a war against a suddenly superior naval force (it didn't start that way because of Pearl Harbor). The Japanese also had to suicide from shame (Samurai). It was because their life was so meaningless. The same thinking goes with the suicide pilots... losing is a worse fate than death.
Now, look at the terrorist suicide bombing. It goes after any target (children, civilians, etc...), it will take any number of suicides (not limited to immediate target need), and you can go on from there.