English couple found dead in isolated Tipperary bungalow left estate worth hundreds of thousands. Nicholas Smith (82) and his wife Hilary (79) were found at their home in Cloneen after not being seen for 18 months
This happened in 2022. A couple who were as isolated as the man in Mallow.
That's completely different.
That couple had by choice planned their deaths - or at least that they would die without intervention or knowledge. There was a complicated back-story, particularly in respect of the woman in this case.
While for many of us it is unfathomable, this was their choice.
They planned ahead in terms of payments made to the man who tidied their garden, and so on. Wrote letters to indicate they were going away.
It was in fact those people that they would usually interact with that realised in time that they hadn't been seen and followed up.
Local people knew and spoke to them while they lived there, but they were very private people - and that was their choice.
I'm not sure why you are selecting cases out of context or what point you are trying to make. There are always people who make different choices regarding their interaction with others.