I found me uncle Dan McCann
A very prosperous Yankee man
He holds a seat in Congress
And he's leader of his clan
He's helped to write America's laws
His heart and soul in Ireland's cause
And God help the man who opened his jaws to me uncle Dan McCann
As far as the song is concerned, this is admirable behavior. Of course, the song is written from the perspective of an Irishman visiting from Ireland to look for his uncle. But it's marketed to Americans. The question "is it a good thing to have American legislators whose purpose in life is to work for the benefit of Ireland?" never seems to come up.
And a double reminder that it's an Irish song that tells an Irish perspective,not an American one.
No, it's an American song that tells an Irish perspective. It was written in America to be performed for American audiences.
Why do American audiences appreciate it?
And audiences in America isn't the same thing as American audiences. There was and still is a very large Irish diaspora in the United States. I'd also appreciate a source for the claim that it was intentionally written for American audiences.
This was leveraged (some might say exploited) by unsavory actors in the creation of a reactionary, settler-colonial ethno-state. This should not be too surprising, given that zionism arose in the same sociopolitical milieu that gave us modern nationalism and pan-nationalist ideologies.