For the sake of the argument, let's run through this scenario. You have KK UTG you raise, and the table fold to the BB with A anything, who calls. Flop comes A72 rainbow. In this situation, I'd slow down and let the BB control the board. You have second pair. Get over yur emotional attachment to KK, because no mater how you feel, there is a card on the board that if paired, can beat you. This is the same hand as if you had 99 and the flop comes 1062 rainbow. Do you get upset then?