Why fight it?

It's not that the Bahá'í Faith is the most horrible religion ever conceived, nor is it significant enough to be a threat to the welfare of humanity, but those of us who have experienced it first-hand and managed to wrest our minds free of its little tyranny — we know the harm it can do to persons, though the scope of its influence be small. We who know the harm it can do: are we not duty-bound to bear witness against it?