Considering the ethical reasons of stopping suicide: Why is it that, by default

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Considering the ethical reasons of stopping suicide: Why is it that, by default, our society would tend to reject suicidal behaviors and promote the prevention and stopping of suicide? Why can't a person have the right and freedom to choose what to do with his/her life without approval from others? If leading a lousy or good life is the choice and responsibility of the individual, why should choosing to live no life at all be an option not considerable?