EDIT: no, I don't sympathize with nazis (neither I sympathize with those who call everyone nazi when they're losing an argument ;)
I think they're mainly quick to defederate because they don't want to burn out their mods.
Conflict and drama means lots of work for them so I can see it being an easy choice. Personally I'm happy my instance isn't too trigger happy with it
Forreal your instance might be the one I'm most confused by, you've got like a 50/50 split of chill people who are okay with conversation and people who drop slurs and reply to any attempt at engagement in memes and 
gotcha one-liners.
Go back to whichever 14 year old infested, fake communist, edgelord hideout you crawled out of.
It's intriguing how everyone that views themselves as moderates/liberals forget (or are unacquainted with it) about the paradox of tolerance.
Tolerance implies everyone has a right to express their ideas and you want that. You want everything out in the open, so you can pick at it, dismantle it and render it pitiful, ridiculous and useless.
You want the intolerant crying out loud that you are intolerant as that means you are doing the right thing. The intolerant want silence, forced, while the tolerant want noise, anger, tension.
Remember that anything worthwhile needs to be fought for. Don't regret being vocal and harsh towards intolerance.
Lemmy.ml should be sent to purgatory.
You can't tolerate nazis or tankies. Bad reasoning altogether. Look at the state the USA is in right now because we decided to tolerate fascists.
I'm so glad that the comments have (mostly) finally unified in agreement that defederating Nazis and other hideous people is the right move.
I'm not up to date on the drama. Who got defeded?
Defederating brigaders and trolls is necessary to maintain a healthy community. If your instance is defederated from all major instances, perhaps you should look examine what sort of company you keep.
No offense but this is kind of what happens in real life too. Nazi shows up to local bar. Barman or owner doesn't throw them out. Eventually they invite their friends. It winds up being known a Nazi bar. People who don't want to associate with Nazis no longer visit the bar. This is why intolerance of the intolerant is a thing.