Yes, there are legitimate reasons to wrap a leg in plastic wrap. As another poster stated, a 'sweat' prescribed by a vet, or used by many lay horsemen is a common way to help reduce swelling or add support.
Chains around legs is to prevent horses from kicking. Horses are not always the brightest of creatures. If they were in a confined space and decided they wanted some attention, some may have learned to kick to get it. Unfortunately, the ones that do this continue to kick until something breaks. The door, stall wall.... or their leg. Yes really.
I would like to know what you're calling 'overly thick' shoes. And from which farrier school did you graduate to determine what 'overly flared' is? Wouldn't you WANT a thick shoe on a draft horse who's working on concrete or asphalt or rock most days? It protects the hooves.. and.. a flare is a conformational flaw that may or may not be corrected over time. My horse as a 3 to 7 y.o. had a terrible flare on his LH. It has since been eliminated through corrective trims and lots of balancing work.
I don't think people ignore you because you're in a wheelchair. They ignore you because you're histionic and come across like a trouble maker.
PETA much?
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What is a 'matched show horse'?
How can a flare extend 2" beyond the hoof capsule? Please explain this to me?
And, tight legs are desirable in the show world as well as when a medical issue arises. So a sweat, using glycerine, furacine, DMSO or even doing a warm poultice using plastic wrap all will work toward this end.
The people advising you are not a representation to horses all over the world. They are a very small demographic that specializes in what they do, of course. Just because YOU and your people have not heard of something... does not automatically mean there is abuse taking place.
Continue down this path and you are going to find some pretty unpleasant responses to your inquiries. Going around accusing people of abusing their horses when in fact they're practicing exceptional care is going to end badly for you.
But hey, continue to bring on the TDs because that's not what you want to hear. You WANT TO HEAR people are abusing horses? Why, So you can be right and get all the glory for reporting??