Why do Irish people support certain English soccer teams? Why do people who are not from Manchester support United?
I think you have to be a bit thick not to know the answer to this.
Loads of Irish support NFL teams in the US, and nobody ever questions that. Yet, when Ireland had American football teams, they’d get a handful of supporters, the Irish Patriots, etc fans didn’t give a flying fook about local teams and they’ve probably all gone belly up.