It is probably best to refrain from replying to comments like MysTerri's, because s/he is clearly not receptive to reason. Alicorn reply was the only one needed, plus some silent downvoting.
In a situation this specific, it seems to me to be worthwhile to reply exactly once, in order to inform other readers. Don't expect to change the troll's opinion, but making one comment in order to prevent them from accidentally convincing other people seems worthwhile.
I've created a new website for my ebook Facing the Intelligence Explosion:
This page is the dedicated discussion page for Facing the Intelligence Explosion.
If you'd like to comment on a particular chapter, please give the chapter name at top of your comment so that others can more easily understand your comment. For example: