There are a lot of tanky posts coming from lemmy.ml. Their whole purpose seems to be to troll and spread their bullshit far and wide. They are nearly as bad as the alt-right. They argue in bad faith and celebrate authoritarian oppression. The beehaw mods might want to consider defederating.
Blocking instances is equivalent to blocking all communities on that instance - so that means you’ll still see comments from users on that instance and the users on those instances will still have an influence on your feed via voting.
Just pointing out that letting users block instances individually is not necessarily the desired solution.