Why so many people are surprised by this is a conundrum.
I guess 'wants' trump 'wisdom'.
No one acts (karma=action) without expectation of result.
We act because we have desire and think the action will bring desired results.
The wise know that action also brings unforeseen results.
The fool suffers due to the ignorance of limited vision.
The inner-child cries, "I did not do that" once caught in web of karmic comeuppance.