I can only confirm that you have to behave quite badly to be promoted to the status of a banned member. Knowledge, or lack of it, has nothing to do with being banned. Some people just cannot behave properly in a group or on a public forum and we have to protect the large majority who behave well. So, even when it means losing some amount of knowledge or insight, it is better to live peacefully without their input, than to live in the trenches with it.
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