SINCE THE ERUPTION OF SECTARIAN VIOLENCE IN Northern Ireland 23 years ago, Christmas in Britain has frequently brought the distinctly unjoyous prospect of Irish Republican Army terrorism. 1992 is already part of that deadly tradition. At the height of Thursday's morning rush hour, two bombs exploded in central Manchester, injuring 64 people. Most of the victims were hit by flying glass in the second blast after they had sought refuge from the first near the city's Anglican cathedral. Police, citing phoned messages, blamed the I.R.A.
The double hit in Manchester came one day after a foiled bombing attempt in London. Police...