In fact, the half fleet that Li Wuji left in the Blue Sky Market could've stopped Boss Bai from the massacre—with at least a 5% chance.
They were too proud of themselves to join the carnival of the space pirates. Naturally, they drank far less wine, and they were still rather vigilant and organized. If they had realized what was going on, they could've caused great trouble to the Big Bai Pirate Gang, which was, in fact, terribly outnumbered.
However, they were stalled by another bunch of ferocious lunatics, who were the members of the Business Alliance of Ten Thousand Sectors and the reformists that were unfortunately captured in the battle previously.
The important captives, such as the deacons of the Business Alliance and Zuo Tianying, the market manager, were naturally tied up and delivered to Li Wuji's starship, ready to be escorted to the four families' territory.