He wouldn't be doing it if there wasn't a point to it. The reason he's doing it is to create an order book imbalance which algos will act on and hence he gets filled on the other side. When he cancels orders on the imbalanced side and price moves back. IMO if "spoofing" were simply allowed it would force the algos to deal with it and make spoofing uneconomical.
In my individual understanding, despite N4SD*Q shenanigans of forcefully restricting trading data sharing via contract law and monopolistic behaviour, the markets are still a vehicle for humans, not machines. If humans are discriminated in the markets unnecessarily, then the markets lose their purpose, as it is with all human inventions. Humans create purpose.