Does Everyone Matter...

I think that what Appiah is trying to convey is that every person matters to themselves and everything that each person does makes sense to them. In his book, Appiah says time and time again that people believe what they believe and they have their own reasons for believing those things or ideas, and are not easily persuaded otherwise. It is important to understand that even though we, as in everyone else, may not agree with what everyone else does, it is mostly because we do not fully understand the beliefs or customs of other people. I think that the underlying message is that everyone matters most to themselves.
Again, if you take the statement "everyone matters the most to themselves," and analyze that, I think it is pretty easily understood that America's supply chains are included in that statement. The suppliers, distribute rs, etc. matter most to themselves, and probably look after their own interests and understandings more than anything else. That is why sometimes incidents happen and things get covered up or excuses are made, etc. Supply chains are looking out for their own interests first and foremost and after that, they worry with caring about others.