It seems to be a questionable assumption that other people's interests are best served by

• my subjective evaluation of what is true
• the communication of this in full, regardless of circumstance

I am reminded of the Buddhist terms upaya and prajna which I believe are commonly translated as "insight" and "means" respectively, but which I first encountered as "truth" and "utility". The principle, as I understood it when studying the subject, was that while one may feel in possession of a truth, it is not always useful to simply communicate that truth directly. I have personally taken true/useful as dual criteria for my own interpersonal (though not intrapersonal) communication.

I'll leave the ends-justifies-the-means implication of such a truth/utility formulation for a separate time and place.