I say something and it does not correspond to the truth; it is either a mistake, a misunderstanding, or a lie. If the apologists of the church tells about Joseph Smith one statement, however something else; and this despite the crushing evidence; either they have been mistaken, either understood a little wrongly or simply lied. Facts are facts and these can not be argued away! You asked why this is so important. Well, it is not the single umptieth case where something else was said. I had taken this only as an example. There is a proverb in Germany which one rhymes in German. It is: One does not think who lies once "! Also if he speaks the truth a thousand times "! In German "Wer einmal lügt, dem glaubt man nicht! Auch, wenn er tausendmal die Wahrheit spricht"! And what concerns the topic complex "first vision" alone, is there many statements which are not coherent in themselves. Only you can judge this. I do not know all facts.