Except that isn't the argument. Just like we don't try and save premature babies to try and "be fair" and we don't treat suffers of diseases to "be fair." There is no slippery slope argument here. The onus is on you to prove that there is in fact a slope and then to show how slippery it is.
> Physical work often creates the necessary stimulation that so many of these ADHD cases need.
Who are you to tell sufferers the best way to treat their condition? Don't you think it is best for people to get a say in their treatment?