There are entire communities full of bad faith actors, spammers, and echo-chamber-enforcing mods. We as individual users downvote them with 0 effect. We can block and hide users/communities/instances but that does nothing for the community as a whole. Ignoring them and "not feeding the trolls" is simply not making them go away. Just try blocking UniversalMonk, we all know they have dozens of accounts with hundreds of downvotes across every comment and post and yet they keep going. Or any of the conservative communities who's total post score is in the red.
I've blocked so much garbage that my feed doesn't change very often. I barely check Lemmy once a day now. This does not make for a healthy online community.
Many of us came from reddit where there are many valid complaints for how they run things but one thing I'd like to see return is downvotes slowing down how often a user can post, comment, and vote in a community. If a single user's score drops too low within an instance or community, that user should be rate limited or maybe even auto-banned or maybe an entire third option I can't think of. But right now it's not even a slap on the wrist.
"Grief shared is halved; joy shared is doubled."