Some systems of thought take birth from human desire, others take birth from truth.
There are several advantages I can see in systems of thought that take birth from truth.
The first advantage is that truth (if it is really worthy of the name "truth") gives one the foundation to decide and act in the world. It's much better to decide one's course based upon true data rather than what one desires to be true.
The second advantage I see is that truth (if it's really "truth") is true for everyone. Truth unites persons in community while desires (at their best) produce temporary, cellular, utilitarian relationships of mutual self-interest.
The third advantage I can see is that truth---unlike human desire---doesn't change.