Well, we have solid evidence that about a solid 30% core of Americans are almost literally psychotic (not in touch with reality) - and, most of them are Republicans.
GM dealerships would probably more than likely be republicans --------- so -
there's no mystery really
they are just out of touch with reality ------
electric is coming ------- if that's their concern - then, they are out of touch, it's that simple.
In years to come - there might be far less Caddys in the market if people go away from private ownership due to on call self drives - but, that's a while away yet.
you would need to show us their reasoning - rather than us fumbling in the dark guessing