I don't understand how we can all agree that remembering how much an operation hurts is a bad thing but constantly digging up things that upset you is a good th

I don't understand how we can all agree that remembering how much an operation hurts is a bad thing but constantly digging up things that upset you is a good thing. Meditating on a broken leg won't make it hurt any less, meditating on how horrible your childhood was won't let you have a good one.