In all of your examples, you are depicting suicide as a short-sighted or cowardly act.
An alternative explanation is that suicide is often committed in the pursuit of pain relief. It may be seeking relief from a terrible situation, a chronic illness, cultural damnation, or any other source of suffering.
If your example of a warrior committing suicide was meant to refer to seppuku then the warrior would not kill themselves "because he can't face the shame". I suggest you learn more about the ritual here: http://en.wikipedia.org/wiki/Seppuku
I don't think that it is right for one person to judge the level of suffering another is willing to endure.
An alternative explanation is that suicide is often committed in the pursuit of pain relief. It may be seeking relief from a terrible situation, a chronic illness, cultural damnation, or any other source of suffering.
If your example of a warrior committing suicide was meant to refer to seppuku then the warrior would not kill themselves "because he can't face the shame". I suggest you learn more about the ritual here: http://en.wikipedia.org/wiki/Seppuku
I don't think that it is right for one person to judge the level of suffering another is willing to endure.