Hey, tradition is tradition. Whether it's Irish or not, you can't argue with that
Please feel free to enjoy your questionable meat product and poorly chosen vegetable!
EDIT: I've just discovered that once again, American corned beef is different to English corned beef. Ours is a horrible minced corned beef mixed with gelatin and comes in a tin. The American corned beef we know here as salt beef which I've never heard of.
I'm sure the American version is nicer because to me... there is not much worse than an English corned beef sandwich.