First ensure it’s both warranted and on topic, then that it meets the form requirement, and finally that it does not harm your own case (e.g., when advocating for some legal change, running a values are meaningless K makes your case conceded as meaningless). Of course if the K isn’t airtight, you still need to tackle the main opposing argument… In fact if it is airtight, you’ll still need to tackle that in light of the K (manually apply the link to each contention under its heading).