At times, companies accuse investors of performing credit sales that they make their quotations fall. Is that true?

It is true: there are companies that accuse investors who perform credit sales of making their quotation fall. But the stock market is just a financial market and prices fall when there are more sales than purchases and vice versa. The investors who perform credit sales and the investors who sell their shares - as well as those who do not buy - are all regularly responsible for the fall in prices. Why not accuse the investors who do not buy, as well? If this position were consistent, they should also accuse the investors who chose to buy of forcing the price up!