I think that SI can be a rational choice, but only, ironically, in times of distress. Such as "I'm going to end up losing it/killing myself/overdosing etc if I don't do something controlled to calm myself down"
I think in the context you're referring to, it really is just a rationalization rather than a rational choice. What positives would you get out of SI'ing?
Actually, on that note, have you tried doing up a list of pros and cons?
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