The dissident Republican factions have been trying to raise tensions here for years, in order to get the 'war' started again. Omagh in August 1998, in which a 'Real IRA' car-bomb killed 29 people (including a woman heavily pregnant with twins), is the outstanding example.
Today's attempted murder is part of a pattern aimed at Catholic Police-officers in order to persuade young Catholics not to join the PSNI. One Catholic policeman from my hometown, Banbridge, was killed last year.
The greater danger to our power-sharing set-up is the continued failure of the ruling Democratic Unionists and Sinn Fein - the two largest parties of the 4-party coalition - to agree on the devolution of Justice & Policing from Westminster. The tricky question for our politicians is that nobody can trust anybody else to run the prisons, courts, and above all the Police.
All of this is exacerbated by
the extraordinary goings-on of our 'First Couple', First Minister & DUP leader Peter Robinson MP MLA and his wife Iris Robinson MP MLA & councillor. Iris has just been uncovered to have had an affair with a 19 year old businessman, and to have secured £50,000 for his business from friends in the construction industry.
The Mrs Robinson saga means that this morning's car-bomb was barely in the headlines here in Northern Ireland.
It has also led to doubts over Mr Robinson's suitability as First Minister, and that in turn leads to doubts about the DUP being able to do a deal with Sinn Fein over Policing.