It's precisely because Li Ming wants to do business in this military weapons market that he abides by the market's rules. What's the point of rules if you get squeezed out and lose your business?
He has made it clear that he wants to rip a chunk of flesh out of this market.
Of course, this could have been said before, but the deterrence is not as strong as it is now after this battle.
Even in the Red River Star Stream, Li Ming used special methods to repair the Star Slaying Gun, and although the story was sensational, it was ultimately just about withstanding attacks without striking back.
Surviving the attacks of two S-level life forms without dying while clad in mecha armor does not carry the same weight as capturing a living S-level life form.
Moreover, with an S-level mechanical body standing by, the sheer power on display cannot be ignored.