Preflop All in I can't fold the hand, because the rage is very strong preflop.
If you playing the KK with 3bet, and someone calls you bet, then if the board coming with A, then you can fold the KK for 100% , but depends of your game style.
If the board is coming not a good for you, even if you hit the top pair at the board maybe, the next card turn can be a bet card for you for sure it's a hard decision with you will make, but it's depends of your decision.