I think you overestimate the amount of infiltration of the IRA although I agree there was a a large amount of it going on. Weapons were never really the IRA's thing when you think on it, I mean it was all homemade bombs and mortars etc.
And while some operations were know in advance the reality is many slipped through cos of the nature of a terrorist organisation.
The way I see it the real progress started after Thatcher and Haughey left, there had been plenty talks under Thatcher's reign but she saw things far to black and white, not a good starting place when dealing with terrorists, plus she just did not like Haughey. The talks in the early 90's under Reynolds and Major had a lot to do with starting what we have today.
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