Because anybody who has taken a couple of humanities classes, english classes, philosophy classes, journalism/political science classes or who has spent time critically evaluating art, historical accounts or really anything other than just numbers, code and spreadsheets.... understands intuitively that EVERYTHING human has bias.
It seems like a lot of conservatives and libertarians are jussssssst beginning to comprehend this and again and they want the conversation to be "BIAS BAD GET RID OF IT" because they are children who don't listen and want to throw a tantrum so we can't have an adult conversation with nuance.
We can't remove biases, believe me, human history is written with the countless stories of artists, scientists, kings, religious leaders... who all thought they could do shit like that. The point is you can't. Everything we create and do is biased, everything we create and make is political, these aren't absolutist statements meant to trivialize a critical nuanced conversation about bias or politics though. On the contrary I am calling attention to the vital nature of these topics as the actually HARD part of LLMs or social media. The programming, data manipulation, development of decentralized protocols etc... they are all nearly trivial details comparatively.
Computer science has to try to create imperfect solutions to the bias problem, but it would have a much easier time if it recognized how tiny this whole world of computer science still is compared to the immense amount of knowledge in the humanities produced by generations of artists and thinkers tackling the same problems.
We can't remove biases, but we still have to make better choices anyways.