You're cherry-picking here. You bizarrely called the Smiths "an Irish Catholic band" when virtually everyone who isn't you would surely scratch their head at that one. The Smiths were a British band. You can make your esoteric connections all you want. Morrissey is by his own admission "Irish blood, English heart," so we know where his heart is.
Of course his preoccupations were varied, and the Americana and gay culture are there for sure, but a lot of the references are distinctly English. A Taste of Honey, The Collector, Albert Finney, Tom Courtenay, &c. Viv Nicholson was a cover star unknown to most Americans, I'm sure. As has already pointed out above, Morrissey was a Briton of Irish extraction frequently commenting on Britain, like Shelagh Delaney, and the interloper Oscar Wilde. Anglophiles like me love the Smiths in part because they were so very and uniquely British. They'd be lesser if they were anything else.