It sure is. Wearing specific shoes to school is not the same as mandating crucifixes on schoolroom walls. You keep skipping around the idea that Italian law as it pertains to Italy is somehow irrelevant. Start here at home and put crucifixes on the walls of the schools in your own city before you meddle in other countries' affairs. Why is it that Americans are so quick to tell everyone else in the world what to do when the US morally is heading straight to hell in a handbasket?
My understanding is that it is some fake pan-European entity that imposed itself on the Italian practice — that has been legal in Italy all along.
But be it as it may, so long as a school in Italy is free to hang a Star of David or something else on its wall, I don’t see a problem with all public schools ending up with crucifixes and not Stars of David. It is a decision that is best left to the school principal (who is accountable to the parents in the district), and not dictated by some komissars from Brussels.