Do you have the problematic instances, communities, and users blocked? Most of the maligned content that I’ve seen has come from two instances that I’ve since blocked from my feed, although blocking their bananas users requires each user to make themselves known first. Lemmy requires a bit of custom pruning of federation to fit each user’s tastes, interests, and values.
Secondly, there is a lot of despair going on due to the current state of society. For-profit media will show things through one lens, and non-profit forums will show things through another. There are a lot of people passionate about making a better world and stopping malicious powers.
Thirdly, amassing fandom communities takes time. Everyone is affected by global superpowers and politics, but they’re not going to be happy about it; in contrast, not everyone is into the same specific pastimes. Attracting people to communities for XYZ fandoms/hobbies/passions requires these communities to stand out among the sea of posts and catch the users’ eye, or for the user to actively seek them out and find them.
Last and least likely, you don’t happen to be sorting by Controversial?
Now the track listing for the Van der Graaf Generator album Pawn Hearts makes more inter-connective sense with “Lemmings” and “A Plague of Lighthouse Keepers”, the latter of which briefly references the former in the lyrics.