Interesting video! I would say an existential crisis is akin to having a breakdown, a trigger such as loss, bringing on feelings of why bother, why are we here, what's the point etc. That feeling can lead to lack of self care, depression or even psychosis. So to answer your question, having an existential crisis could lead to passive SI.
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein