Rhubarb, I truly believe I understand what you're saying about developing countries - I just don't agree.
How about if I put your argument in my own words - you can tell me if I've misunderstood - and then point out the bit I don't agree with.
Let's say we have 2 babies, Sam and Sally.
Baby Sam was born into an impoverished family who have no access to clean water, not enough food for the family, no access to sophisticated medical care.
Baby Sally was born into a relatively wealthy family who have clean tap water in their house, plentiful nutritious food, excellent medical care whenever they need it.
Both Sam and Sally are formula fed.
Now, if I've understood you correctly, you're saying that when it comes to formula risks, for various reasons baby Sam is much more at risk. I agree with that.
To take it to its logical conclusion, in an imaginary situation where you could choose for just one of them to be breastfed, the one that would benefit the most from breastfeeding is Sam. His odds of dying in infancy are far higher than Sally's.
Now, this is where, I think, our opinions start to separate. You seem to be saying that because Sally has clean water and medical care etc that it makes no difference whether she's formula fed or not. The clean water will stop her getting gastro infections, if she does become ill, she can go straight to hospital and be treated, etc.
I disagree. I think that it's too optimistic to believe that the advantages of a wealthy society can "mop up" all the excess risk. Take diabetes for example - this will have a big impact on a child's life no matter where they live. It's a horrible thing for a child to cope with.
So in summary: yes, Sam is running a big risk by being formula fed in his environment. That's why healthcare workers are putting a huge effort into promoting breastfeeding for the Sams in the world.
But Sally's risk isn't zero, and never will be. And Sally's mother has a right to know that. What decision she makes is up to her - but it must be an informed decision.