There are too many dimwits who think Lemmy was made so that they can build their echo chambers. So, there is no discourse, just stupid people encouraging stupid people. Anyone that comments otherwise is immediately removed.
Most mods are dumdums. Most are obviously politically and ideologically motivated. It's their job to prune anything they disagree with, which means they can't help themselves and ban everyone. Most of the time it's a complete waste of time to comment in smaller subs. The dumdums have taken hold either by making the subs and controlling them, or by volunteering as mods with no oversight.