I don't play those games much, because they tend to spill out into the next game/real world. It's not that someone will feel betrayed and have hurt feelings, it

I don't play those games much, because they tend to spill out into the next game/real world. It's not that someone will feel betrayed and have hurt feelings, it's that it's a perfectly sensible strategy to have the next game in mind, or to involve existing real-world relationships. I prefer games that are over when they're over. That said, when I have played such games, because my group wanted to play them, I've had a policy of just not lying or making promises. I may say things like "that doesn't seem like it would benefit me does it, because then B will surely just toss me out of the lifeboat next turn", and of course NOT speak up when someone makes a wrong assumption to my benefit. It feels like I've won more than my fair share of those games still.