Cozie,
Your shelter had declawed cats because it isn't illegal to do, and so the trailer park faction continues to do it, just as they continue to smoke in homes with children, feed their children garbage, and other unhealthy, antisocial behavior. If declawing were legal in UK, I am sure that a similar proportion of the population would also have their cats declawed. That doesn't make the procedure "common", and it doesn't mean that the majority of educated people aren't horrified by the practice (just as horrified as educated British people are!). Most vets will NOT declaw. Having a declawed cat is unacceptable in educated, civilized society, and all but unheard of in such populations. Just because I know SOME British people engage in anti-social or cruel behavior does not mean that such behavior is common in the UK, or that I would seize upon this behavior as a common UK custom. For example, I know someone who purchased a dog with docked ears and tail in England, but I don't think that tail and ear docking are common, and I wouldn't tell Americans that, "Tail and ear docking are common in the UK and vets push it" just because it happens occasionally and some vets will do it.
And no, Cozie, I don't think that "anti-American idiocy" is harsh in a thread that mentions voice box removal in cats as if it is a common or regular "thing" in the US. I've never heard of that, and as I said, if it exists, it is done by a tiny, weird fringe group of lunatics. The fact that someone could mention such a thing, and that multiple others believe it, IS anti-American idiocy.