HN has had plenty of threads about Go over the years. What's different here is that there was just a big Go flamewar yesterday (https://news.ycombinator.com/item?id=31191700), from the same site. Having another big Go flamewar the next day is a really bad idea, because then on top of shallow ragey flameposts (boo) the thread will fill up with fluffy ragey metaposts (double boo). More explanation here: https://news.ycombinator.com/item?id=31207126
"Shameful censorship" is one way to put it, but front page space is the scarcest resource that HN has (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...) and the amalgam of upvotes, flags, software weightings, and mod actions is what determines which stories end up / stay there vs. which stories fall off. This is the cycle of life on HN—it's always been that way and always will. One psychological effect is that everybody feels like their favorite topic is under-represented (or shamefully censored!) and in a way everybody is right.
I've often joked by adding "even Rust hackers feel that way" but maybe that's not the best line to use in this case :)
p.s. I feel like it's been a long time since HN had a passionate explosion about flagging and censorship (side note: ctrl+f misinformation...yup, that too) around a programming language. In a way it feels like a healthy sign. Like a family fight at Thanksgiving - at least it's about, say, a board game or something.