Continued facing points in the topic-start letter to me:
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Pausing for the moment to look at something in this quotation from the letter:
Michael Grisham wrote:As long as you have not been discriminated against on the basis of sex, race, national origin, religion, age, disability, and in some cases sexual orientation, Jack has the absolute authority to publish, edit, or ban you from his site. He does not need any rule or reason. The above is how I understand the law in the United States of America. It has been that way for over two-hundred and twenty-eight years.
My focus for the moment is "absolute authority" to "edit" items on his site. Yes and no and more: He has not absolute authority to injure people or corporations by editing in or out matter. He has authority to do much, but he probably is not authorized to change matter in ways that unfairly (say via deliberate misrepresentations by way of editing) injure persons or corporations; he has power to do the injury; he also has the vulnerability to end up culpable for injuring and liable for damages, even on matters beyond the bases you listed. Loss of reputation via acts may play; loss of fair market processes may play. Errors deliberately made on stock matter can come back to bite publishers via calls for big remediation. E.g., sg might deliberately put a "not" in text in a way that would cause great damage to a person; if such act was found to be deliberate rather than a typo, then sg might be found to be liable for damages resulting from his deliberate insertion of "not" in someone's text. E.g., hypothetically, a poster writes "I do agree to pay $1000; and I say this publicly." If sg inserted deliberately "not" to get to "not agree" then he could be held responsible for such deliberate misrepresentation and damages might be involved.
So, editing has responsibilities under the law; we are not allowed to deliberately injure people by way of misquoting or misrepresenting authors' text. Freedom of speech probably implies being responsible for deliberately misquoting or misrepresenting the expressions of others.