For some reason i didn't read this part of your earlier response:
The right question is what brings this consistent ideology or theme. What makes it popular enough that enough people decide to participate in it that op finds this pattern and asks it online
Now i can put the pieces together and have a rough idea where you're going with this.
Anyway, let me insist that you're asking something from the OP that it wasn't trying to give in the first place. Your approach is academic, the OP's is emotional.