[papertyger]

Your definition of "credibility" is too narrow.

cred·i·bil·i·ty ˌkredəˈbilədē/ noun the quality of being trusted and believed in. "the government's loss of credibility" synonyms: trustworthiness, reliability, dependability, integrity; More the quality of being convincing or believable. "the book's anecdotes have scant regard for credibility" synonyms: plausibility, believability, tenability, probability, feasibility, likelihood, credence; More

[South40]

My definition is spot on. If you or others choose not to believe what I say that is up to you. But you are doing so not because I have said anything that is provably untrue but because you believe otherwise. I can't change your beliefs or what you think of me. nevertheless, my credibility remains intact.

I'm not into the circular argument and this is going nowhere, Bye.