It's also a website with a culture of methodically archiving people's behavior, whether you agree with how it gets used or not. I agree with freedom of speech, but also I do think people ought to be held accountable for the things they say and do.
There used to be a banner in that site that said that white-knighting was not allowed. I understood that to mean that if someone posted something refuting another post that was criticizing that person they would get banned. I would agree with you if kiwifarms was a truly free site that aimed to stay objective but this does not seem to be the case.
I'd be awfully hesitant to trust factual claims made by people who speak and behave as that site's users do. Nothing I've seen from them suggests a willingness to scruple at fabricating evidence.
"Held accountable" on the post seems to include moral depravity like "he posted anti-Trump tweets". I don't think that's really accurate here.