I have Milan, Fiorentina and Roma die hard fans friends of mine that were cheering or us in CL.
Not everyone is supposed to think, eat, sleep like you my friend. You have your analogy and theory I have mine. I want Serie A teams to dominate again(but against certain teams such as the English ones and the likes of Barcelona, Real Madrid) this is how I would like things to be. This doesn't make you or makes me a bigger Juve fan than the other. It's just a way of seeing things.
My bestfriend is a Man. Utd fan btw, he's going to attend the Arsenal - Barcelona game cheering for the Gunners. I don't see it as a weird thing. They can be rivals domestically and not necessarily abroad.