Some of it is radical ideas with hateful messages.
It hurts feelings rather than threatens individuals or is child porn.
But when feeling could be hurt when directed at a different demographic, it is left up and not touched.
All depends on who the gatekeepers are.
It's also done to bring more attention to the demographic that is being deleted.
Might be to bring more sympathies for that group.
It's a tatic either way.
See it in MSM all the time.