That seems really over-generalized and I disagree with it. The rational person you have created doesn't understand the complications behind suicide, both external and internal. Life is designed to survive, to not kill itself. It's incredibly difficult to override this no matter how rational you are.
You can be completely rational and know that a spider (I'm referencing any spider that genuinely cant do much of anything harmful) can't do shit to you but if you already have a deep embedded fear of spiders, you are still going to be afraid of them despite all rationality. Death is far more embedded than what is likely a learned fear of spiders.
This fear of death can cause you to act irrationally even if you can think rationally about it at other times simply because fear does that to you. People who want to commit suicide, not just impulsively, typically don't want to
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A significant part of it just means that you have a reason for doing something. To you it is rational to follow the law, because it would be stupid to break the law and go to jail when you can just have a job and a house and not break the law. It's a simple chain of conclusions you can make about each action that says its far smarter and more logical for you to meet what you want out of life by not breaking the law and not going to jail. For someone else who is not in your position though, they may want something different out of life, they may not have the resources you have etc., and breaking the law can be rational to the point where among the choices they have and the resources they have etc., it provided the best opportunity for reward for the risk they were willing to take. Rationality is strongly defined by the context surrounding it. Maybe that dilutes the word for most people, to me it just explores an area of reason that I don't think many people bother to explore because it's actually quite difficult to understand another human