The war was essentially forced upon the RM. Look at any decent history of the war, (I'd recommend A Secret History of the IRA) the IRA had moved towards a less violent stance by 69.
The PIRA had more to do with old Catholic "Defenderism" than Republicanism - that helps to explain so well why the majority of SF and the IRA didn't revolt against the peace process.
A lot of the people who later joined Republican armies had started out in the Civil Rights Movement. That includes Gerry Adams, Francis Hughes, Dominic McGlinchey and others. I've also personally known people who were involved with stewarding civil rights marches who were Republicans.
You're far off the mark if you believe there was a conspiracy amongst the Irish middle class to create the IRA. All evidence points to the contrary. The middle class, most especially the church and middle class Irish nationalists were attempting to have the barricades taken down and for normality to resume. It was a section of the working class in the six who wouldn't go back to being treated like second class citizenst that the IRA was spawned from.
Did resistance to Franco leave Spain better or worse off, Durruti?