How much would you trust a person with the fact that you could tell them something sensitive and they wouldn't use it for their own idealistic empowerment?

A tells B something, B believes in it mostly because B can use it to reinforce whatever beliefs and thoughts B has had about a certain issue. A has basically enabled and empowered B.

Now B goes and tells C, for lack of an arbitrary audience, or perhaps the entire known world due to the fact that the information got displayed on a widely, very widely, accessible medium.

The world now sees A's thoughts clearly smack dab in black and white (or perhaps a different coloured backing) through B's apparent lack of self control and judgment and for that, A inevitably feels responsible for the 'leak'

The complete morosity of it. Talk about a secrecy fail.

This is why I say sometimes things are best left unsaid.

Because in truth, everybody lies. It's just who you trust enough to think they wouldn't.