First thing, because as an internet forum there is unlimited access provided, and in that case can lead to chaos during situations there is no control. This would lead to decreased protection from a legal opinion's case in the event it is necessary to jurisdict problems here by legal attention. If you know of
Chaplinsky v. New Hampshire 315 U.S. 568 (1942) - you are aware that the court ruled that fighting limits the first amendment protection for the indivudal who has violated that right.
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Furthermore AD doesn't apply to the consitutional amendment because it is personal (private) property owned by an individual, which is exempt from Constitutional laws. You are all here signed up on by your own will thru the disclaimer on registration, which allows you on Alex's domain where he finally provides to you discussion based on his terms. As long as you waived your ownership over the rights to your posts to the admin on forums, (it is at registration) decisions are entirely theirs as what they want to do on their server.
However, we do adhere to certain structures of federal/state law especially for example with acting law inforcement, we will be required to do so by federal mandate.