Veritaphobia: fear of the truth
Veritaphobe: one with veritaphobia.
Example usage: People who think we can balance the budget and pay off the national debt without raising taxes or cutting spending are veritaphobes, just like those who think banning guns will solve all our crime problems.
If you want it to be all-greek (rather than half and half) it would be “aletheiaphobia”.
Along the same lines, I propose “eleutheraphobia” (fear, or hatred, of freedom).