Can you think of a good reason why they just didn't freeze the whole market (buying and selling) instead of allowing institutional traders to buy and sell freel

Can you think of a good reason why they just didn't freeze the whole market (buying and selling) instead of allowing institutional traders to buy and sell freely while only allowing retail traders to sell and in many cases forcing them to liquidate? In my view the clearing houses had liquidity issues while many of their clients likely had solvency issues which this brick on buying alleviated. And the IBKR chairman admitted as much.