/r/all is heavily manipulated and it's quite obvious a small cadre of power users and power mods are responsible for the content and character of what gets shown. I would not be surprised at all if there is dark money behind all of this, especially considering the political nature of it all.
The default feed is completely worthless. Unfortunately I think that's what a lot of people see. Carefully curating a list of quality subreddits is key to a good experience, but most people either don't know to do this or don't know how.
Even r/Lego went through a phase where minifigures mocking prominent Republicans and Donald Trump were posted. It has since quieted down but the mods took an obviously hands-off approach and it was likely they agreed with the message and had no qualms about the divisive content.
