I was not implying that mountain lions / cougars do not exist. They are magnificent animals and their range may be expanding into areas with no recent history of populations. If they are, the questions would be how would they be "managed" and would man want to co-exist with them? My guess would be that with like many other apex predators, that there would be strong resistance.
My comments were more specific to the New England States, where there are continual "sightings". I spoke with one woman who claimed to have seen a "mountain lion". When I asked her for a description, she described a bobcat. I told her that she had described a bobcat and her reply was, "what's the difference"?
Certainly there mght be expansion of or overlap of range, though that would need to be supported by telemetry and tagging studies.
There may have been collection of specimens in Wisconsin inclusive of DNA, that does not confirm a reproductive population exists there. I believe there also exists some controversial studies specific to the collection of DNA from cougars, as conducted by some of the more "prominent" researchers within the field of wildlife biology.
As for roadkills being unheard of, I believe that it was impactive to the mortality of the Florida Panther. All other large animals regularly succumb to the automobile, more so in areas of high traffic flow (Eastern Seaboard States). The question remains, where are the roadkills?
Another good point that was brought up within the context of this thread was the abundance of "game cameras" that exist and are used year round by their owners. Photographic "evidence" is less reliable without being able to confirm where it was obtained. None the less, many other mammals are caught on film, where are the cats (that is, in states with no known population)?
I simply ask, show me the evidence.
Carver