Yeah you can argue that /pol/ sways far right and you'd be correct, and I don't personally condone most of the opinions that are represented there, but take a look at the general threads, you have a pro-ukraine one and an anti-ukraine one, both with equal representation. I can't think of any other site that has this. Any other website following the classical formula of pseudonyms and upvotes/downvotes, like Reddit, hackernews, and so on, are destined to be an echo chamber. You can feel it here too, even though HN is heavily moderated.

And say what you want about 4chan, but the most popular open source machine learning frontends come from /g/, that is, Automatic1111's stable diffusion, ComfyUI from Comfyanomyous, and oobabooga text-generation-ui for running LLMs locally. It's a place which is hostile to the lowest common denominator of the internet, which functions as a great filter for better or worse.

If you want a comfortable safe space that shields you from being offended, the popular social networks are great for you, but if you have thick skin and can handle unfiltered conversation, there is nothing more visceral and organic than 4chan, despite all its warts.