The Federal Reserve does not want to take back its money because it is acting to stabilize the economy. The Fed's money is used to purchase securities from banks, helping them to maintain their liquidity and lending capacity. This money is not expected to be returned, as it has been spent to promote economic growth. Additionally, taking back the money would reduce the amount of money in circulation, which could cause a decrease in consumer spending and economic activity. Therefore, the Fed's policy is to keep the money in circulation, to help the economy recover and grow.