I tend to agree, but if the sightings are real and the activity is increasing. The US might want to inform the opponent that we know who is violating our airspace, we know it isn't alien technology, and we know how they are doing it.
If your "opponents" are a threat you wouldn't reveal any information other than what you want them to know. If they are a non-threat, it might be like warning a child about crossing a road.
