Let's try a classic "counter conspiracy". Usually I tend to consider both the faces of a medal. So, what it the so called "truthers" are actually individuals who receive suggestions from government environment to generate disinformation? Why should the government use them? [Damaging government image itself ...] Simple: to generate the counter reaction. And since not rarely the arguments of the truthers make them look like loonies, doing this the government puts them under a bad light, diminishing their credibility. This kind of disinformation wouldn't be new for me: when I was around 20 I was ufologist and it was a common persuasion that some governments created fake UFO reports and events to spread disinformation about the phenomenon.