Hi Falcon
Not sure how long you've been following this thread, but there has been a fair bit of detail about the science behind A2. You may prefer to reject the research that is in any way connected with a2MC, and that's a legitimate position to take, but there is now heaps of independent scientific research, published in peer-reviewed journals, not only backing it up but leading the way. For example, research showing the link between A1 and autism came out of US universities, and was a surprise to a2MC. Parents of autistic kids in Australia also discovered for themselves that switching to A2 greatly reduced the effects of autism. And research identifying links between A1 milk and sudden infant death syndrome (SIDS) likewise came from teams unrelated to a2MC. Won't bore you with more examples.
You mention that Fonterra does not promote the A2 hypothesis, and the fact that it is not publicly encouraging NZ dairy farmers to convert to A2. Well, the idea that A1 could be triggering human medical problems such as diabetes originally came from Fonterra's chief of research, Dr Jeremy Hill, who co-authored a paper on it, although he keeps quiet about it nowadays. Fonterra also fought A2 Corp through the courts (unsuccessfully) to get possession of the crucial patent on identifying A2 cows. Why? And you don't see Fonterra and its big research team disputing the research being done all round the world that backs up the risk factors in A1 milk, or the claims made by a2MC. Why? They would if they could, obviously, but they can't.
Finally, you are completely mistaken in suggesting that the dairy industry's livestock improvement catalog is not weighted in favour of A2 genetics. It is heavily weighted in favour of A2 genetics. As most people with knowledge of NZ dairy breeding know, the Livestock Improvement Corporation clearly identifies whether its premium bulls are A2 or not, and virtually all of them are now pure A2. So even though Fonterra doesn't want to declare publicly that there are human health reasons for converting away from A1, dairy farmers are moving quietly towards conversion by breeding from LIC's A2 bulls.