What's this?! No mention of Marx yet?
A Marxist reading of Irish history would describe, and indeed have predicted, a bourgeois counter-revolution to "keep the peace", which is always shorthand for "preserve capital", immediately following independence.
This isn't to say the immediate causes of the Civil War have been misidentified, just that they were only the immediate causes.
The motivations of a certain class (I don't think bourgeois is right for Ireland at that time, but we may use it as sufficiently close description) obviously underpinned their pragmatic approach, or what they would have described as pragmatic.
This is a feature of all revolutions. Maybe the classic examples are France in 1814 and the aftermath of the July Revolution. Victor Hugo calls them the "contented" cohort, the man who has time to sit down; but in sitting down, may stop the march of progress – I'm paraphrasing, but I always liked that analogy!