I grew up round the corner from Summerhill (which I presume is what you mean by 'Sommerville') and Buckingham Street, and still walk through the area most days. My user name might be clue as to where I live BTW.You obviously don't regularly visit the inner city ghettos of the North inner city of Dublin very often: Buckingham Street, Sommerville and the surrounding slums. .
I remember Summerhill back in the 70s/ 80s, and it was pretty grim, but the sheer fact of it being in the middle of a capital city, with better resources, and greater opportunities - and politicians (one in particular) who worked honestly to improve the lot of people, meant things could, and did, improve. Part of the problem with Moyross, South hill is their relative isolation from the city, and the lack of any coherent political representation of the people there.