I don't have an issue with the defederation call, and transparency regarding decisions around defederation is very healthy and good!
However, one of the more complicated implications of Lemmy's federated structure is that defederation on instances is more of "everybody's business" than it is on Mastodon, since Lemmy instances host communities and not just users. I don't have much sympathy for free speech absolutists who feel the need to frame all defederation as "censorship" or some of form of tyranny, but since it is potentially splitting the user bases of communities on blahaj that folks on other instances have joined, it makes sense for folks on other instances to want their voices to be heard.
(Obviously, there are constructive and non-constructive ways to do that.)
This is also why the answer to everything won't be "just run your own instance." It's important that more instances have well-developed and transparent moderation standards both internally and externally, and users will need to be savvy about the moderation landscape when they choose what instances to start communities on. (This will be a little less loaded of a question if/when Lemmy gets the ability to migrate communities.)
I think there's a lot of "cross that bridge when we come to it" mindset amongst some of the bigger instance admins that is in the long run is much more detrimental than any one defederation call could be.
Unsurprisingly given its extremely high profile as a purveyor of transphobic coverage, many mastodon instances have greeted them with a firm block. (If this confuses folks who don't pay attention to this sort of thing, just picture in your head if it was fox news.)