Is there such a thing as "truth"? Yes, of course the answer is yes.

The masses have never thirsted after truth. They turn aside from evidence that is not to their taste, preferring to deify error, if error seduce them. Whoever can supply them with illusions is easily their master; whoever attempts to destroy their illusions is always their victim.

-Gustave Le Bon - The Crowd: A Study of the Popular Mind
(emphasis = mine)

Apparently this guy agrees:
The point is that we are all capable of believing things which we know to be untrue, and then, when we are finally proved wrong, impudently twisting the facts so as to show that we were right. Intellectually, it is possible to carry on this process for an indefinite time: the only check on it is that sooner or later a false belief bumps up against solid reality.

-Eric Arthur Blair
(This will make a lot more sense once you look him up…)