I don't think anyone is holding Ireland responsible for "Irish" pubs. It somehow just became a genre of bar on its own, and it's easy to do in a lazy caricatured way, suitable for someone whose chief aim in owning a bar is rooking tourists: shamrock-based logo, change the name to "O'Whoever's", and have Guinness on tap, good to go.

Then you have other places like my old hangout from 20 years ago, which had a few of the same visual signifiers of Irishness, but the owner being in fact an Irishman, he didn't feel the need to go overboard with that. Hope that place is still open and doing well.