Synopsis: Studies are reviewed that show how exposure to violence has the potential to push people into participating in paramilitary activities. They illustrate that even after peace has been negotiated the social problems do not disappear. They also demonstrate that the confl ict may well have caused the perpetrators of political violence to become psychologically harmed since they become victims of their own violent actions. The need to address these problems is discussed in order to reduce the risk of the confl ict smouldering on and then reigniting. In conclusion the importance is emphasized of politicians and military leaders refl ecting on the lessons learned in Northern Ireland when deciding how to contain or react to terrorism across the globe, regardless of its origins.For many people living in the UK, the world has become a more fearful and less safe place since the terrorist attacks of 11 September 2001 and the resulting global ' war on terror ' . The attacks on the twin towers of the World Trade Center killed over 2,800 people with victims coming from 85 different nations, including Britain which lost 67 citizens, and many more of the casualties had close family ties with the United Kingdom. Since 2001 Britain and the city of London in particular have been the target of terrorist attacks linked to Islamic extremists, the deadliest attack being on the public transport network in London killing 52 people on 7 July 2005. In addition, the British media, 1 Correspondence concerning this chapter should be sent to Neil Ferguson,