Today reminded me of the show Liar Game, about deceit and pangsei-ing (abandoning) others. Slightly similar, though no one could possibly be out to “kill” everyone else.
If everyone was for himself, some might lose out. If everyone cooperates, everyone will benefit. If everyone cooperates except one, he would lose out. Cooperating is key. However the problem occurs when the results were to be very different from expectations. Would someone panic and follow his own way? If there were sufficient people who reacted this way, the situation would change such that those who cooperate would lose out.
This would not happen for us because we know each other. However, imagine doing it with a group of strangers… It would be difficult to trust them, especially when the scenario becomes weird suddenly. I believe for such instances, it would be best not to have any prearrangement unless all possible situations are covered in detailed and people would tend to lose out if they fall out.
Which, if you have watched Liar Game, is the reason why the characters cooperated in the later rounds of the game. They knew each other from the earlier rounds which put the bad guy (a newcomer) in a far more unfavourable position than you would think. (Recommended to watch, quite interesting)
