Either Push or Fold.....
you're betting preflop was wayy too light! and you have all these poeple in the pot with you
We are all aware it's push or fold, hence why I edited my post that you quoted so that it reflected such.
5xBB opening a pot is just fine for a raise.
Stakes are an important factor here. Look back at Zachs KK preflop dilemma. If he actually gave villian credit in that spot, he lays down the best hand. I think shoving here is +EV, just due to the raising range of MP1.
I just can't agree with the stakes argument anymore. They are different from one another but the fact is there are many many competent and capable players at the low stakes these days since it seems everyone is a student of poker.
Yesterday I'm UTG with AK ($25 NL), I raise, get the BB as a caller. Flop is AA6. I check behind. Turn is an A, I check behind. River is a Q. BB leads for $1 into a $3 pot. I raise to $5. He says, "Anyone else, I would call, or probably raise, but not you," and mucks. Wow... not only did he make a good play based on me playing mediocre, but he was intelligent enough to discern between me and the other players (using and understanding PokerTracker etc). These are not your $25NL players of 2 years ago.
So ask yourself what range of 2 hands do we beat here? Not only that, but our buddy smooth calls an all-in after you've shown strength and so has someone else. I would say that it's probably 50/50 if you are ahead or behind *IF* MP2 is a tremendous donkey. Other than that you are behind here at a $10 NL table, a $25 NL, a $50 NL .... and a $1000NL table.
The moral of the story is this... if UTG+1 and MP2 are that big of donkeys (especially MP2) to get their money in here while being behind KKs, then you are best off waiting for a different situation in time to extract a few buy-ins. Specifically, a situation where you have much more control.
p.s. This is absolutely nothing like Zach's post. First off, there is simply no conditions I can think of where laying down KK heads-up pre-flop is ever acceptable even at the big-game (Farha vs. Greenstein for example in HSP). The only conditions where it's ok to even consider laying down kings would be multiway all-ins before you.