How does injecting money solve a problem that’s not caused by lack of money? This market downturn isn’t a lack of liquidity, or a lack of money, or toxic assets like the mortgage backed securities. People aren’t going to stores, restaurants, and airlines because of SARS-CoV-2, not a lack of credit or money. Printing money isn’t going to create customers for businesses effected by this pandemic.
Also, there is no situation so bad that it can't be made worse, and companies laying people off makes it worse. There are bills to pay and people still need to buy food.