LLMs can be injected with biases as well. Just look at Grok's responses any time it's tagged in anything mildly political.
Bias is useful and inevitable
Good journalists are open about their angle. Bad journalists tell you they are "unbiased" and "just bringing you the facts".
LLMs are much harder to fact-check because they can make anything up based on their training data and weights without sources.
There's also Grokipedia, supposedly make by Grok, where I'd point to section 3.6 ("Controversial topics"): https://arxiv.org/html/2511.09685v1