Is some of the "backlash" against diversity, equity and inclusion efforts in 2020s America a manifestation of attempting to prevent a shift in the status quo of class structure in America?

How is the history of the space potentially useful in easing the potential transition to something better?

Almost every new technology goes through a moral panic phase where the unknown is used to spawn potential backlashes against it. Generally these disappear with time and familiarity with the technology.

Bicycles cause insanity, for example...

Why does medicine and vaccines not follow more of this pattern? Is it lack of science literacy in general which prevents it from becoming familiar for some?