Comment by vintermann

You have to at one point do something to another player, which they thought and hoped you would not do. But since you both know that, whether you lie or not is really quite irrelevant. It's not your assurances (or lack of them) they put faith in, unless they have misunderstood the game.

To take your example, instead of "you're right, makes sense" (arguably a lie, maybe), you can just say "That may seem sensible" or "I hear you" (definitively not lies). It should rationally not make a difference for their actions in the game.