I don't understand how some people don't fear death (tw:suicide, depression)
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I live and breath the revolutionary catechism, which might be a good read to understand your own feelings through something of a complete opposite of how you feel.
But it's also important that there exist ordinary, self-preserving people. Those are the ones the revolutionaries seek to protect and draw their passion from. The same way you think of your mother in case you die, she might feel similar to you. To each person who is still socially connected there are other people who matter. And those, either in concrete relations (like somebody's child) or abstract social understanding (the set of all children in a community) are what usually leads people to be willing to die.
Another important point is to consider how dire the situations are for the revolutionaries you mentioned. Imagine a genocidal imperialist country is invading your homeland, knowing full well that survival would mean slavery, exploitation, torture and all that happened in, for example, the Japanese invasion of China. In those conditions choosing death may not only seem preferable, but also just accelerating the same outcome in case of defeat.