But trading wasn't stopped. Avenues for non-professional investors to continue buying shares were cut off. They were still allowed to sell shares as desired.
I don't really have an opinion on whether the GME thing is a pump and dump scam, or a real opportunity to enforce a classic "The market can remain irrational longer than you can remain solvent" lesson to those shorting these stocks.
But I do have a real issue with removing just the "buy" side of the equation. Price is always a function of supply and demand, and I don't understand how anyone could justify halting just buy orders. The obvious impact of artificially reduced demand is that the price will drop.
Further - if this price drop was designed to protect these firms from possible losses (and I don't really care whether that loss was by allowing unvetted shorts by investors who don't have the capital to cover, or whether it was collusion to protect other parties) then I still don't see how you can reasonably come to a conclusion that looks good for these firms here - They're manipulating stock prices to avoid losses.