I don't think anyone was disputing that it's the best source...however, it being the best source doesn't mean it's the ONLY source.
I agree with this. I exclusively breastfed my baby until she was over 1 and because I have low iron issues, she was tested at her checkup. I believe it was at her one year checkup, because she was still not eating solids. She was found to be low in iron, even though I take supps. So she took iron drops for about a year, until solid food was well established. And, I nursed her until she was 2.5, so that was not the issue.
I think it is important to recognize that while breastmilk is the best food for babies and nursing well into toddlerhood (and beyond) is healthy, that does not mean that the child will be getting all the nutrition he/she needs. If the mother is lacking in certain vitamins and minerals or if there is a medical reason the child is not getting all they need, there could be cause for supplementation. As it is in the best interest of the child's health to do this, when you have good reason, why on earth would anyone argue this? Why on earth would anyone see fit to question any mother's attempt to make sure her child gets the nutrition he/she needs. The "lies" refer to the blanket statement that all children need supplements. Some, in fact, really do. To question the need for this in the children of others is not very supportive or helpful.
natesmamma - if something is nagging you, then perhaps there is something to this. Look at Dr. Green's info about anemia and see if your child has symptoms? If so, testing may be a good idea. If not, don't worry about it.