> being a regular corporation is not the only possible model

the point is that it _is_ the only possible model in our marvellous Friedmanian economic structure of shareholder primacy. When the only incentive is profit, if your company isn't maximising profit then it will lose to other companies who are. You can hope that the self-imposed ethics guardrails _are_ maximising profit because it the invisible hand of the market cares about that, but 1. it never really does (at scale) and 2. big influences (such as the DoD here) can sway that easily. So we're stuck with negative externalities because all that's incentivised is profit.