One of the winners was the PIRA and
SF. By your logic of "look who benefited by a load of dead civilians which created a backlash against dissidents" we must suspect
SF of imvolvement and knowledge of this bombing.
But that would be bollix. Im only pointing out where your argument is leading.
The RIRA was severly hampered by the Gardai. Yup, our very own boys in blue. They collared McKevitt, they collared Campbell.
As for British knowledge of this act, I mean come on. Republicans have slaughtered civilians in the past (look what Enniskillen and the Shankill bomb did to IRA support) but they survived. Why would the RIRA be any different? All they had to do was put the head down for 6 months, apologise, and they could well survive as an organisation. If I was an MI5 mandarin, Id say to myself, 'well a Republican atrocity could push the Loyalists to commit an atrocity, which would then lead to the PIRA ending the ceasefire'.
The RIRA f***** up on their own. Its their fault. Accept it.