Why does sectarian conflict like that seen at the Holy Cross Primary School in the Ardoyne, North Belfast in October 2001 still happen, when Northern Ireland is meant to be going through a peace process?

Why does sectarian conflict like that seen at the Holy Cross Primary School in the Ardoyne, North Belfast in October 2001 still happen, when Northern Ireland is meant to be going through a peace process?

 To explain why things like this happen we must analyze what happened at Holy Cross in 2001. In the Ardoyne area there is an interface community which means that Catholics and Protestants live side by side.  This in itself is a recipe for disaster. There was always a lot of conflict in the area but the reason for the holy cross conflict was set off by simply Protestants and Catholics annoying each other and provoking fights and conflict. There are few more obvious signs of sectarian division than the scene that greets you at Ardoyne Road, north Belfast. Irish tricolours fly from lampposts starting at the southern end of the road. A few yards past an invisible border at Alliance Avenue, the green is replaced by the orange and loyalist flags flutter in the breeze. Ardoyne, an "interface" area where Protestant and a much larger Catholic communities live cheek by jowl, has witnessed some of the worst violence of the Troubles: Mass movements of people, open street fighting, clashes with security forces, shootings and intimidation. High levels of unemployment persist and this epicentre of the Troubles remains a fertile recruiting ground for paramilitaries. Along with west Belfast, the north of the city has been the centre of killings in the Troubles. If the peace process must work anywhere in Northern Ireland, it must be seen to work in Ardoyne.