Unfortunately there's no stopping thread drift unless we totally censor threads to the point of disallowing any free discussion beyond the original poster's point. Once threads drift they can go anywhere, good, bad or ugly.  

Many people, including folks posting to this thread, have derailed topics in the past and will likely do so again. Original Posters have no control over how a thread will go and should never expect to have such control in any open discussion. The closest thing to a control allowed the original poster is that they can ask that their thread be locked once their original question has been answered. Beyond that, only a breach of the TOS will get something closed.

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