My downkarma stays. You really should have made this clear in your post, and you advocate for a departure from radical honesty even when that works, instead of discussing strategies for determining whether your interlocutor is ask, guess, or (gasp!) tell. This advocates an overly radical departure towards lies for anyone, and argues for defection on PD. It's one thing to say that given people will lie, you should become skilled at it and learn to detect them; quite another to advocate that it should occur from the start.