That's largely to the credit of a very different set of Nationalist political activists and not to the (P)IRA, who were a major obstacle to it for the bulk of the civil war - along, of course, with a majority of Unionist politicians, we shouldn't forget that part.
My contention is with the term wrecked, call it a quibble if you like, but it can be read the wrong way by somebody not having the appropriate context, and overestimates the impact of their political violence on a society that already experience plenty of unionist violence.