There are many many people who could say they hold a "legitimate" grudge against NPO. Anyonein FAN GOLD, or any number of small alliances who were given terms so tough they could not survive them.
More on topic...I started in peace mode to be a second wave. Came out, got in war, got nuked, made it back to peace mode to get over nuke anarchy, and am back again. Very few people really believe that PM is not a valid tactic. I think it is more that people want to take the piss out of the NPO for a prior stance. Yes, it could be looked at as hypocritical to point it out as well. I guess a lot of people don't care.