Well, for one, I didn't say "staunch Catholic," I said "the most staunchly catholic people I know," and secondly, while these people choose to out their own beliefs before that of the church, by and large their beliefs do line up with that of the church. Just not on this particular issue.
The catholic church has done a bunch of fucked up shit in Ireland and as a result even the most catholic people here hold a certain amount of mistrust for the church, especially in the younger generation.