I think this is actually a myth. It's appealing, to us who love truth so much, to think that deviating from the path of the truth is deadly and dangerous and leads inevitably to dark side epistemology. But there is a trick to telling lies, such that they only differ from the truth in minor, difficult to verify ways. If you tell elegant lies, they will cling to the surface of the truth like a parasite, and you will be able to do almost anything with them that you could do with the truth. You just have to remember a few extra bits that you changed, and otherwise behave as a normal honest person would, given those few extra bits.