[kazinator]

You might think, but those symbols could also be stigmatizing. Or personally offensive.

Imagine being a 75-year-old who runs ultramarathons, having to have a walking stick on their car.

A hearing impaired person may not want to be symbolized by their less-than-well-working body part.

[Symbiote]

The symbols used in Europe are ears. (Not on cars but in general.)

I doubt the deaf people care, though I also don't doubt at all that some virtue signallers are highly offended on their behalf.