HN Point of Order: Should I upvote responses to stupid comments?

People regularly post HN comments that clearly indicate that they haven't read the linked article, and are rightly downvoted for it. My question is: should people responding with clarifications receive upvotes?

Often, someone responds to such "didn't RTFA" posts with a brief summary or pithy comment about how the parent needs to RTFA. This is free karma for the responder, who only needs to restate the article and/or insult the parent, both of which are noise to me. Do others disagree?

The guidelines are not explicit about this, so I am explicitly asking the HN hive mind.