I spent four years at ND, so I have an allegiance to my alma mater. What allegiance do I have to millionaires who would play for any team that pays them the most money?
I didn't go to ND, yet I have an allegiance to them. What about any arbitrary hobby of yours that you don't have a major background in? Do you not read books or watch TV shows because you don't have any connection to the writers?
Its obviously your right to like whatever you want, it just seems odds that someone would love ND football but not like the NFL at all. Unless you're not a big football fan and you just like ND football because its Notre Dame.. That makes sense to me.