Exactly. Use of red sauce in Italian cuisine is what, if it were invented today, we would call "Ibero-Italian fusion cuisine"; and the Spanish and Portuguese red sauces were developed after their early exploration of the Americas.

So much of creativity is the result of mixing diverse elements in unique ways. And it's especially rich to rant about "purity" or cultural "ownership" regarding something that is fundamentally the result of such a fusion.

EDIT: Speaking of which, if you haven't tried pasta or pizza with a Portuguese pepper-tomato sauce, you're missing out.