To keep this thread on Danish royal titles on-topic, I respectfully suggest that any discussion about abdications in Denmark, Norway, or Sweden be moved to a more appropriate thread.
Here is the thread on Abdication in the General Royal Discussion forum.
Abdication
It is unfair, but then the whole system of nobility is anything but fair. It's based on inequality.
Most of the system is "equal" in the sense that you are using the term. If a nobleman has marital sons of different races or religions, for example, those sons will be treated equally as far the devolution of noble titles is concerned.
Fix the family conflict.
While a substantial number may find that the issue with the titles is something where a compromise can be found, the majority by all accounts still believe in a slimmed down monarchy. It was the way it was done that was wrong.
Thank you for the response. That does make more sense to me given that, as you said, the Danish public has a history of supporting a slimmed-down royal house, and the representative opinion poll posted earlier in the thread indicated support for this particular change by a 2 to 1 margin.
In addition, from what I have read on this and other forums, it appears the Danish public has not been very sympathetic in the past to royals who aired grievances about their real or perceived demotions in the royal ranking order (Hereditary Prince Knud, Prince Consort Henrik, even Prince Joachim himself in his earlier interviews about his role as "spare"). So it would seem the difference this time is not that someone is being demoted or publicly unhappy about being demoted, as both have happened before, but the exposure of the clear mistakes made by the queen in her private relationships with her family members.
On a somewhat related note, I think it appropriate to pay respects here to the Queen's cousins Elisabeth, Ingolf and Christian. The three of them were not only sidelined and demoted to various degrees, but (as discussed in their threads) in a far more ruthless and hurtful manner than Henrik, Joachim or Nikolai ever experienced. It would be understandable if they had gone public with their hurt, but despite that, they humbly accepted their fates without complaint and have been nothing but charitable and generous in their public comments about their uncle's family.
It still makes zero sense why it could not have been an issue of "going forward" the children of these four grandchildren will not have titles. OR the HH could have been removed and only Prince/Princess left like it was done in Sweden.
Reasonable people can disagree on whether it needed to happen, but it is not true that there was "zero" sense to the title removal. As the stated and speculated reasons have already been discussed at length in this thread, I will not rehash them, but in short, removing titles immediately reduces the number of princes and princesses who will be pursuing private careers in the next few decades, and avoids the pitfalls of removing titles at marriage (which was the expectation before the Queen's decision, as Countess Alexandra confirmed, because it was what happened to the children of the last younger son of a Danish monarch).
Those considerations do not necessarily justify the decision. There are also legitimate and compelling arguments on the other side. But it is simply not true that there was no reasoning at all behind the Queen's decision.