"I have already acknowledged that all sides have been at fault over the centuries but it is true that until NI understands it has to demonstrably stop fighting it will not truly prosper."
There have been horrific atrocities carried out by both sides, yes. And yes, the violence needs to stop.
However, attitudes and the use of language matter. Your parent and child analogy annoyed me for two reasons. First, like I said, it is patronising and displays just how widespread it is for Britain to assume an authoritative role towards Ireland.
Second, as a 4 year old girl, I had a British soldier point his gun at me at close range, and I was not allowed to move away from him in a confined space. For a good twenty minutes. So on a personal level your "parent and child" analogy hit a nerve, because as a real flesh and blood child scared and very confused in that situation, that soldier was a terrifying man - not a kindly-but-stern father/ uncle figure.
He can't have been more that twenty years old himself in hindsight, when I remember his face. I appreciate he was probably scared too, in a shit situation.