My interpretation of this might be different, but I agree wholeheartedly with my interpretation.
Being morally just doesn't just mean "not causing harm" directly. It means striving to not cause harm both directly and indirectly. As someone who lives in the USA, our entire society is built off of exploitation. The less expensive something is, the more heavy the exploitation likely is. The cheapest manufacturing is done in countries where labor is exploited or even enslaved, where the manufacturing process can pollute and poison the area with little consequence (to the manufacturer), and where the powerful can force deals on the government to let them extract valuable resources and pay a fraction of its value - depriving the locals and nation prosperity. Even when buying US food products, the food industry mostly relies on extremely poor conditions for the animals it keeps, taking advantage of farmers it buys from or employs, and may even employ migrant children for dangerous slaughterhouse labor.
Avoiding these kinds of practices throughout most supply chains is sometimes impossible and usually more expensive the more thoroughly you manage to avoid the practices. Even then someone has to check in and constantly verify that the practices are legitimately avoided and not just greenwashing or fraudulent.
It's really quite depressing.