<p>Just so that this question has an answer:</p>
<ul>
<li><p>One method is to post your own answer to the question. In passing, it can demonstrate that an alternative strategy is not correct.</p>
</li>
<li><p>If the answer to the question is not known, then asking and answering a question can be one method to provide a demonstration.</p>
</li>
<li><p>As always is the case with interacting with other users, it requires careful wording to provide constructive feedback which is not read as an affront. This can be tricky.</p>
</li>
</ul>
