Hmm, I'm not sure I agree with you here. If truth = demonstrated reality, you still have to consider how it's demonstrated. What is the standard required to qualify as a demonstration?
Can it be true that an act is good? From whose perspective? At what point in history?
Is it true that life is valuable? Whose life? Weighed against what?
Is it even true that a rose is red? If you and I could see through each other's eyes would we agree on what red is?
All of these "truths" require assumptions or biases which we're often not even aware of. What we call reality is our brains trying to make sense of electrical signals from our sense organs. We're not as infallibe as we think.