not pushing pre-flop with KK

[Dominic]

sorry if this has been discussed before or is nothing new...

but I was wondering if holding back with KK pre-flop and not pushing when you get re-raised is a better strategy?

that is, when your stack and that of the villain is relatively deep, you pick up KK...you raise...someone re-raises you...and you just call, instead of re-raising and/or getting it all in before the flop.

Is there anything wrong with waiting to see if the flop contains an Ace? Or is this considered weak?

If you push pre-flop and get called by Ace-blank, the villain has 5 cards to hit his Ace...

is my thinking faulty? Weak-tight? get it in there when you have the best of it, and let the poker gods handle the rest?

Would this be a better strategy when talking about tournaments and not no-limit cash games?

Thanks!