It's called glory hunting. I don't see anyone who isn't born in Nepal supporting them. Why is that?
I don't see a problem with having a soft spot for other nations team. I always want Croatia to do good whenever they play. I'd be the happiest fellow if they had won in 98 but to celebrate on the streets? nah. And as @
Ragazza well pointed out, when people start saying "we" and "us" and acting like they're of that origin, they're just fools.
Especially when we're talking about Italians of all people, most likely the most proud and nationalist people there ever was. They'd laugh at those foreign "fans". I'm of both Italian and Portuguese descent and i couldn't care less for their NTs.
I respect Italy for all they did for Football like we did. And for all the Juve players who shone on that beautiful blue shirt, but that's about that. If they crash against my team i don't care where my grandpa came from i do hope his nation is given a lesson.
But oh well, to each his own i guess.