Occasionally people submit comments on a post, which actually contains content referring to a different post. However, we prefer that comments on a particular post deal with that particular post.
If people post comments which deal with a different post, the discussion will become incomprehensible to others. Therefore we have no choice than to disallow such comments, i.e. they will not be approved or they will be removed.
So if one wants to comment on, for instance, “In vitro meat and cannibalism”, please post the comment there and not on, say, “uterine transplants: a first step towards male pregnancy?”.
Unfortunately WordPress does not allow us to move comments from one post to another. People who post an otherwise decent comment on an irrelevant post, will receive an email with the request to resubmit their comment at the right post – provided that they have filled a correct email address.