For me it comes down to stats. There number of positive CWD deer consumed by people is unknown but probably well of into the 10s of thousands or maybe 100s of thousands. Not a single case transmitted to humans. There are so many other things to worry about. How many people say they would never eat CWD positive meat but text while driving? There is lots of research that shows a negative impact on health by drinking beer, how many people drink? You could go on and on. Lots of known risks people ignore but CWD people are terrified of. With that being said it is a threat to wildlife and I hope research continues.
These are not the same things, and it's an example of how bad humans are at instinctively judging statistical phenomena.
Drinking beer means you ingest 1 standard unit of ethanol per beer. For a 5%-avg 12oz beer that's 0.6oz of ethanol. You will have some pleasant effects and very minor impairment, plus a bit of residual damage to some of your organs. Nearly all adult humans can consume 1 beer and then drive or do other "risky" tasks. But 10 beers is too many for all except an extremely tiny number (perhaps 0) to consume and then safely drive a car.
It's not linear, though. Can you handle two beers? Probably. But lots of people can't. At 3, now the vast majority are starting to get impaired. One is almost always fine. But even at two, a statistically significant portion of the population should no longer drive.
OK, so take a breathalyzer if you're worried, right? The trouble is, rationalizing this way means you can get behind the wheel after drinking too much and tell yourself "the road is empty, I'm good." So you endanger yourself, any passengers you might have, and any pedestrians or other drivers you go by on the way home, but maybe it's only 10 people total, and you always made it before. So it's a small risk of a small tragedy.
But prion diseases are highly contagious. They're not "another beer." Other prions like CJD have already crossed the species barrier, so we know they can. We know that it's not that CWD can't, it's that it just hasn't
yet. Once they evolve this adaptation, they stay adapted - there is currently no known cure for the human form of CJD (vCJD) and no way of reverting it to the form that "only affects cows." Fortunately, they caught that one early and Google says "only" 232 people have died of it so far. But the cat is most definitely out of the bag on it, and actually several hundred people contract it every year.
Here's where statistics can easily lie to you. Here's a chart of diagnosed cases of vCJD over time:
Looks good, right? We've really got a handle on it! But people don't die from it instantly. Here's a chart of deaths from it:
Not quite so good after all. It'll go down in a few years as those who have it today finish dying, but vCJD is with us for good now.
So here's the problem. Saying things like "but people drink and drive" or "but those cell phones" is called the Nirvana Fallacy. Just because we don't have perfect answers to every issue out there doesn't mean we shouldn't be smart about this one.
It's actually a form of elitism. CWD adapting to humans could take a mont or a hundred years, but it is always sitting there, knocking on the door, waiting for you to open it. Meanwhile, you're essentially saying "well it didn't mug me the LAST time I opened the door - should be fine, right?" because you don't want to be bothered with it.
That's fine if it WAS just another beer - a small tragedy in your local paper that shouldn't have happened, but the rest of humanity moves on. But in this case you're potentially hurting a LOT of other people. If you're Patient 0 (the one that lets the cat out of the bag), you're passing this gift on to every other current and future hunter that will now need to worry about this for sure.
And don't forget what we do to "fix" CJD in cow herds today. Since we don't have a cure, we kill them all.
This is not "just another beer."
Look it's not for me to tell anybody else how to live their lives, but I'll tell you this. If CWD crosses, and all of hunting as we know it today changes forever, it sure won't be my fault - at least not for lack of trying to follow any and all advice wildlife biologists have for me. I don't need that on my conscience.