Don't use a disease as a political weapon and you won't have the problem.
Lieing with impunity to people with this disease will not be excused. Micheal J. Fox may have Parkinson's, but he has lied in a political ad.
How does accusing Fox of "faking" help the cause of exposing false stem cell research myths?
It's an attack on Fox, just as Terry McCauliff would have done that Rush himself has pointed out and condemmed countless times over the years. It does no good and serves no purpose in educating the general public but it does feed right into the Media's attack on Rush. Rush could have easily have condemmed the ad without insinuating an insult to Fox.
Again, bad form and poor choice.