Why they commit suicide bombing?

Obviously, people who commit suicide bombing are not contented with their lives in this world. It is not just that they are not contented but they do not have any hope whatsoever to attain things in this life which would make them contented. In this situation of discontentment coupled with hopelessness, someone gives them hope that if they commit suicide bombing, they will get after their death that with which they will be contented. Hence, they commit suicide bombing.
The only way to dissuade them from suicide bombing, is to give them hope that they will get in their life in this world that which would make them contented.