It also needs to be mentioned that the entire business of MMs is to capture the spread by buying at the bid and selling at the offer. As such, they are passive market participants who will only transact if someone executes a marketable order against one of their resting orders. This means, they can only be as (naked) short as someone else is willing to buy from them. But they are also not interested in having directional exposure and will go to great lengths in order to balance their inventory.

The idea that MMs would somehow use their privilege to actively sell massive amounts of non-existent shares into the market in order to manipulate the price downwards is preposterous. That is literally the opposite of their business model and such activity would certainly be flagged by regulators.