I did not perpetuate any myths.

Yes you did. You posted this:

Iain Duncan Smith, the Work and Pensions Secretary, is determined to stop what he regards as abuse of free cars for the disabled...

The cars are not free. Severely disabled people have to pay to lease the cars from the mobility component of their DLA. That component is not a car allowance. It is intended to compensate them to some extent for the particular difficulties and expenses they incur when moving around. The recipient may use it in any way they choose.

I posted without comment a KIA advert

And you didn't notice the blatant error, motability instead of mobility, in the ad??