No. I don't expect people to reveal everything they hold in their head that could be relevant to the discussion. That would be ridiculous. I do expect people to be wary of their biases and not make assumptions without adequate evidence.
Protist made a very reasonable response to the article given what they knew, and was clear that they didn't have enough information to make further judgement.
treadful's response was saying there also isn't enough evidence to conclude that she isn't racist. Many would read that as saying she's probably racist, so my response is intended to curb that bias.
I'm not accusing anyone of making baseless accusations. I am preemptively drawing attention to a common bias and asking people be aware of it and to avoid it.
I thought Samvega disagreed with me when I said baseless accusations are bad, but they denied it and refused to elaborate, so I have no idea what that's all about. They have not made any themselves and I never accused them of such.
I don't know what you mean by "defense". I'm restating my main point.
Yes. It's often better to prevent a Bad Thing than to fix the consequences after Bad Thing has happened. I don't understand what you're disagreeing with.