Truth is completely subjective and dependent on the person perceiving a particular thing. There are no objective truths because all truths humans can perceive are inextricably tied to the subjective perspective of the person perceiving and believing in them.

Even ostensibly “objective” truths, like the speed of light, are only considered truths because of a large consensus that they are, in fact, truths. But to someone ignorant of such a truth, it can’t be truth because they don’t understand it.

When someone speaks of the truth setting someone free, I believe they are generally talking about freeing someone from the chains of ignorance and giving them knowledge gained by rigorous searching and belief in a trustworthy consensus.

The difficulty is that not all sources of information are rigorously gained, and an ignorant consensus is harmful and needs freeing from because it is created from ignorance.