I can imagine that what you're saying is true if there was no danger to the public.

But if someone were to trade on the knowledge that a supplier had delivered faulty airbags to an auto manufacturer without telling that manufacturer, I doubt this would be looked at kindly by the courts.

But I agree that the metaphor is not ideal. Selling 0day exploits to that broker is much worse. Any seller would have to have a reasonable expectation of aiding organised crime or terrorism.