hmmm....
Is stabbing an "integral" part of the game?
First, what is a "stab"?
IF a stab is attacking someone that you have TOLD (honestly or not) you will ally with, then YES, it is part of the game, as you should tell every other player on the board that you will ally with them. And you have to attack someone...
IF "stab" means to betray one of your "real" allies, then it gets stickier.......
........I think of a stab as an attack on one of my "real" allies, as in an ally that I can take to the final draw, and trust that if we stay committed to the alliance, we actually can draw. A stab against them may lead to a solo, so it has merit.
BUT, as BESM can attest, dip players have long memories, and what happens in one game affects our play in later games.