Two schools of thought: 1) it's a cooler and you're suppose to get all the money in pre-flop. As bmeelneg said, in the long run it's the right move. 2) imo given the scenario early in tourney and not knowing how people play, i would have just called his 3-bet as you had position. with the button, you have much more control of the pot and can see how he's playing post flop. If he's willing to limp with AA pre-flop, I would assume he would try and slow play post if the flop wasn't too much of a threat to him. Guess what I'm trying to say is that given your position on the button you could have possibly gotten away from the Kings or not bust completely.