The people you listed all see themselves as members of the out-group, and many of their critics agree with that, so they're all on the same page about that.

The big progressive names today often feel as they they are in-group with respect to people who are smart, well-educated and worldly. The out-group members feel like they're fighting a battle to keep from being wiped out altogether, and that affects how much energy they put into what they do. It's like some sort of insurgency with alot of them, especially the three you listed.