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People prefer certainty. There's a psychological need to explain events or phenomena rather than accept one's ignorance, to say 'I don't know' when faced with insufficient evidence.
Imagine you're in a pub and overhear a man talking to a friend about UFOs: 'Last night I saw a strange red light in the sky, it moved too jerkily to be a plane or helicopter so it must have been an alien spaceship'. This is an argument from personal incredulity (or personal belief or personal conviction), the fallacy of inferring that because you personally find something improbable or hard to believe, it is therefore untrue, and instead your preferred explanation is true.
Even though the man in the pub didn't know what the red light in the sky was, and personally thought it couldn't be...