Yeah, PETA (not surprisingly, and I certainly wouldn't trust them) clearly didn't handle the rescue well, but I don't understand why some are arguing in support of the ranchers. Is that indeed the owner of the ranch in the video, talking about performing amputations? Then it's indefensible. And you're quite right that continuing breeding was clearly not the most responsible thing to do in the situation, that was inevitably going to make things worse instead of resolving the problem. If the animals indeed had no pedigrees, selling the whole herd was unlikely to work out, and could have led to the animals ending up in worse conditions.
Might be an idea to contact the Humane Society, and make sure they have accurate care information. Anyone tried that yet?
Then for those concerned about doing the best by their animals, the most logical approach, is to make sure there's nothing to criticise in their practices, isn't it? Not to focus on the worry about being attacked, and respond to that fear by defending someone who doesn't actually deserve it. The priorities should be obvious.