I suspect it's rooted in defensive reactions. People are worried about their jobs, and after being raised to believe that human thought is special and unique they're worried that that "specialness" and "uniqueness" might be threatened. So they form very strong opinions that these things are nothing to worry about.
I'm not really sure what to do other than just keep pointing out what information we do have about this stuff. It works, so in the end it'll be used regardless of hurt feelings. It would be better if we get ready for that sooner rather than later, though, and denial is going to delay that.