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Not quite.
Like, there's a scary amount we don't know about the brain and how it works.
But I think it's a little different than you said. It's the brain trying to figure out how it would deal if that happened.
Like, you avoid stabbing yourself by not stabbing yourself.
But your brain is evaluating if stabbing yourself so you can practice surviving a stab wound would be a good idea.
Which, sounds crazy, untill you realize most of what humans do for fun involves tricking our brains or bodies I to think we're in danger. Hell, even the drive to "play" is just tricking us into exercising so we're stronger if we do have to fight.
Even tickling is just teaching kids what parts to guard in a fight.