I actually disagree.
By not doing anything officially they are saying to the world that they believe that Diana didn't cheat on Charles before Harry was conceived
No, by saying nothing, they are in fact saying nothing.
To make any public announcement about this, one way or another, would give the Dianafanatics more ammunition about the 'uncaring' RF trying to undermine her name.
If the DNA results prove that Charles is Harry's father, the DNA results will show nothing of the sort. If any fanatics want to use this as ammunition they don't have to wait for DNA results; they will find a bunch of other evidence to buttress their cause.
The RF, and particularly Charles, are apparently convinced that Charles is Harry's father and that is all that is needed.
No, the Royal Family and the British monarchy are a public institution based on genetic heredity so the identity of Harry's father is of public concern. If Harry were the grandson of the President of the United States, his parents assurance that he is their child would indeed be all that is needed. But Harry and the British Royal Family are not in that position.
Once the press start forcing the RF into making certain announcements where will it end? Will all royal babies have to be DNA tested before being accepted?
This is a concern but I think Harry's paternity only came about because Diana had an admitted affair with James Hewitt. Several people believe that Charles started his affair with Camilla before he said he did and so its natural for some people to think that Diana started her affair before she said she did.
To be fair, in the era before DNA tests, if a Princess had an admitted affair with a man other than her husband, questions of her children's paternity would arise, unfortunately the primitive technology available at that time would not allow the paternity question to be answered to satisfaction so the stain of suspicion would be on the children for their entire lives.
Some people state with authority that no test will prove conclusive to the fanatics and I agree as far as the fanatics are concerned but I have stated in this thread again and again that not all the people who believe Harry is Hewitt's son are fanatics and I believe they can in fact be convinced by a DNA test. Duchess even said that she would be convinced by a DNA test and she is no fanatic. Yet they ignore these statements that we make as assiduously as the fanatics who ignore hard evidence.
We are not just blowing smoke or making up some fantasies here. We are talking with real people's experiences which are just as valid as the experience of the fanatical friend of chrissy.
The question about Harry's paternity cannot be conveniently pegged to the blame of certain unreachable fanatics.