First, stock index futures are derivatives of normal financial transactions, and there is no reason to close positions.

Second, you think that the stock market decline is caused by stock index futures, but what you don't know is that stock index futures is an important hedging channel after funds, national teams and foreign investors buy stocks. If not, the stock market will only fall even worse, because without hedging channels, these main buyers will not take the initiative to start buying.

So you ask such a question, which proves that your understanding of stocks is far from enough, and you need to learn and improve.