What could be the reason for the sharp sell-off in the stock market?

Is the fund investigation intended to solve the problems in the stock market, or is it just creating confusion? The index has been artificially inflated for years by certain stocks while others are suppressed; it's clear someone is profiting from this. I suspect that stockbrokers' money is being used like interest-free loans, and that fortunes are being amassed through leveraged trading in futures and warrants, but I don't know the truth. I can't say that certain governments or holding companies are involved in these transactions. Manipulation has been detected in the stock market, and some funds have been liquidated. Did those exorbitant increases in stocks cause so much damage to the stock market index and investors? Who is trading in the stocks that are driving up the BIST (Istanbul Stock Exchange), and for what purpose? Are those transactions in accordance with financial ethics? Is artificial intelligence being used to rob stockbrokers? Shouldn't these issues be investigated first?