One factor that one needn’t be a physicist to see is that black holes became a “thing” in popular culture, in a way that “red dwarfs” and “white dwarfs” never did. No one says that red dwarfs, for example, are a gateway to another universe. That sort of thing may affect people’s willingness to evaluate the evidence base critically. Cf Darwinism.
It is most unfortunate that both scientists themselves and the popular press discuss black holes (bh) as if they are (a) a scientifically defined object; and, (b) an experimentally observed one.