I totally disagree with your claim that alcoholism is directly linked to sexual abuse in the MAJORITY of cases. Majority means over half. There are probably 5 times more alcoholics than there are victims of sexual abuse, and of course not all victims of sexual abuse become alcoholics. Don't ask me to cite statistics for this, because I have not and will not research it. I just don't believe your claim.
Everything else I totally agree with you 100%. There should be no such thing as a taboo subject. Nor do I believe talking about is any more of a trigger to relapse than my drunkalog is a relapse to others. If an individual is uncomfortable the subject of a particular thread, they can look at other threads.
Now I totally support locking down a thread that degenerates into flaming or other BS. I also support locking out users who just want to stir the pot and are not interested in helping others.
Just my 2 cents.