Suicide is a very rational reaction to life. Contemplating suicide can be a rational reaction to introspective inquiry into the state of 'being alive'. However

Suicide is a very rational reaction to life. Contemplating suicide can be a rational reaction to introspective inquiry into the state of 'being alive'. However, committing suicide is never a rational action. There is no logical argument that leads to the conclusion that suicide must be committed, because there is no set of purely objective premises from which the argument can start. There is always a premise that introduces someone's beliefs about the value of being alive and that premise cannot be defined in rational terms. In the end it is always a circular argument: I must commit suicide, because circumstances are such that I believe I should commit suicide. By which I say absolutely nothing about the ethics of, or the validity of emotional arguments for, committing suicide.