While I do find this conversation interesting, and it's not the really bad sort of derailing, it probably should be taken elsewhere. This is a "Blogging against Disablism Day" post after all.

(I'm still playing around with how strict I'm going to be, but if I don't make an effort to enforce the rules now I'm going to fall to bits when I encounter narky defensive people who refuse to admit they even are derailing)

But if you drop a link saying where the conversation is going I may pop in once I've had a chance to read the article :)