Nope, they're not that common. Deer are common. I've seen roadkill once and living deer twice.
And you live in western NC? I find that hard to believe. I don't even live in western NC, and I have seen more deer there than that. I used to deliver drugs to Henderson at least once a week, and it was not uncommon at all to see live deer or roadkill there, or in any other part of the state in between. Living in eastern NC(Greenville) if I don't see at least 2 live deer a week, it's because I haven't gotten out of bed. And seeing only one roadkill deer a month would be a very conservative estimate. Heck, I've already seen one today, lol. Had to call 911 one evening because a deer had been hit by a car, but was still alive and laying, or sitting, or whatever deer do, in the middle of one lane on the highway just below the crest of a hill, making it a traffic hazard.
Also saw a black bear on one drug run to a different part of the state, and without a doubt, I can understand how people might think they were seeing a bigfoot, especially if they were preconditioned to such a thing. Also saw a dead black bear near a friend's house last year. Hit by a car. Never seen a dead bigfoot that was hit by a car though. No one has, despite all the sightings that happen near roads.
A month ago, when walking my dog, we came across a dead red fox in the field by my house. Two months ago, the police had to come out and kill a sick gray fox that had gotten into my fenced backyard and was tangling with my dog. Feared it was rabies, but it was something else. The same fox used to eat cat food with the cats at night. Now only possums come, lol. Funny thing, the cats weren't afraid of the fox, but they run from the possums.
Anyway, I'm rambling. The point is animal sightings, dead or alive, are not that rare at all, unless you never get out of the house. That you say you've spent lot's of time outdoors, but hardly ever see things as common as deer makes no sense to me, but it's possible. With 6 billion people on this planet, it's not possible that none of them ever come across dead animals. It's also highly unlikely that not a single one of them would ever come across a bigfoot body, unless bigfoot didn't exist.
PS
No, I wasn't a drug dealer, lol. I used to deliver drugs to nursing homes all over the state for a pharmacy.