Authors must spend months, years making fantasy believable in a single work while reality runs rampant and complete chaos elsewhere.
If you haven't caused a scene in a psych unit, it's just because you haven't been inside long enough.
(a.) Capable of being believed; credible.
Screaming and repeating lies makes them neither true nor more believable.
Doubt is a question mark; faith is an exclamation point. The most compelling, believable, realistic stories have included them both.