Yell,
Well, in that case, every country is unique. What's the point then?
Zarf,
My experience is that useful lies generally have more cons than pros. For instance, it was once practical to lie to people of "democratic" states that they were the rulers to gain their compliance. What has this done other than raise a generation that pursues a misguided ideal?
For me, idealists are the greatest danger. Many have identified the practice of an ideal for a lie, but failed to substitute the ideal for something reasonable. Even if guided by a practical minded group, the lie frustrates communication and a satisfactory solution from ever being reached. Relationships are a perfect example of this. Everyone who bothers to reflect on experience knows that relationships are conditional, and sex is overall a condition for a man's commitment. But if that condition is denied or too taboo to talk about, and is thus never discussed, then both parties will suffer.
So the dangers of useful lies are:
1. Lies becoming uncovered but the ideal remains a goal.
2. The lie prevents a satisfactory solution from being reached.
Honestly, if I ruled, I would have no problem telling a reporter on public television that I sabotaged a political competitor's aircraft. After all, my justification for ruling would be that I can deliver public services better than anyone else, and I bloody hell would deliver on it. My candor would be legendary for a practical purpose: to create a problem-solution orientated political and journalist culture. Why would that be practical? It's simple. A successful government is one that delivers public services to satisfaction, and the way to deliver is to identify the problems and devise a strategy to best respond to them. To do that, you need the freedoms characteristic of liberal government like freedom of speech. Sadly, freedom of speech has become problematic, because the lie has come out but the ideals remain popular. This is most clearly evident with the "Occupy Wall Street" protests. Their ideals have made them so confused that they can't supply a coherent argument for the elite to take seriously. Too much of their speech is moral speech, and this only alienates their concerns from the elite, who may naturally see them as lunatics. I mean, I would take a group's concern over a policy or police corruption much more seriously than a mob of idiots demanding I be brought to "justice" for "robbing" the people, or violating "human rights" or "international law" and blah blah blah.