When someone's fear comes from ignorance, what kindness is it to leave them in the dark?

CS Lewis once observed: "Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive"

I suppose it's a good thing, then, that I have no power over you - beyond that which you may have created de novo, by choosing to care about my opinion - and therefore have no means of exercising tyranny.