Question: How is it that every industrialized nation in the world has banned Monsanto's rBGH as unsafe, but it's legal (and unlabeled) in the United States?
Answer: In order for the FDA to determine if Monsanto's growth hormones were safe or not, Monsanto was required to submit a scientific report on that topic. Margaret Miller, one of Monsanto's researchers put the report together.
rBGH isn't banned in Canada because the hormone is unsafe, it's banned because increasing milk production in cows is an animal welfare concern. The reason you can use it in beef cows but not in dairy cows is not related to human health. Increasing milk production causes more mastitis infections. That's not a result of the hormone, that's a physiological response to increased milk production. This is all available on the Health Canada website.
And independent reviews have assessed the safety, including to see if there is a discernable difference in the IGF hormone content of the milk. There is none. And even if there was, insulin like growth factor would not survive the conditions in your stomach. Have you ever seen someone take oral insulin? Such a product doesn't exist because there is currently no technology to reliably get the hormone into your blood stream intact.
Lastly, perhaps you are unaware of the structure in these organizations. It isn't just FDA employees that peer reviews submissions.