1/ There is a category of people who took a arduous mental journey to get comfortable with the idea of post humanism, uploads, and a gradual extinction of biological humans.

2/ They think this idea is so radical and counterintuitive that when they hear the distinct concern of an omnicidal AI killing everything on the spot, they can only interpret it in that frame. That's the read I get from Sutton for instance, but also a bunch of e/acc affiliated people.