Looking at instances such as Hexbear and lemmygrad.ml... are they wrong though? And many other instances have given Hexbear a platform to promote and host i.e. spread their content across the wide Fediverse.
We are a tankie bar, plain and simple. Yes you can block it, but most instances have not historically gone very far in that regard, from the perspective of a new Reddit refugee, e.g. a centrist, religious, American who may not like what is going on but also is put off by calls for things such as outright murder.
If we want to expand, we need to get better at labeling the spaces so as to make people with a wider (aka more diverse) set of backgrounds comfortable here. We won't though, instead preferring to simply claim that everything that "in-group" says is correct (and often not allowed to be questioned, though mod & admin tolerances varies wildly) and everything that "out-group" says is 100% wrong and everyone is "stupid" for believing such.
Beware of unearned knowledge.
You "lose" 100% of the battles that you choose not to fight.
Besides, people here are reporting that the content is already gone. Even if it comes back, it likely will bounce around back and forth but not return to this same state, so this was transient.
Even so, it seems not wrong? "toxic or abusive content being common in the Fediverse", regardless of how precisely that is measured, seems entirely accurate to me. YOU (and I) may choose to block such content, in part by being on an instance that enacts this choice for us, but that does not mean that such does not exist. Head on over to Chapotraphouse@hexbear.net to get a taste of what the Fediverse offers. It does exist, and while Lemmy.World defederated from it, so many other instances including Lemm.ee did not. Or Lemmygrad.ml.
It is so easy to forget about what was shoved under the rug, but the Fediverse is more like 4chan than most of us care to admit. Just because there are no Nazis currently standing in your little corner of a Nazi bar does not mean that you can invite your Jewish friends over to walk (safely) through the front door.
The Fediverse can be quite toxic. So much so that I've entirely stopped recommending it to people irl. We need to be more acceptable to people if we want to change our image, not just pretend that we are fine.