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In plain English, the church's position seemed to be that The Miracle was not very dangerous to the Catholic faith in Italy, but might be quite damaging to the Catholic Church in the U.S. In Italy, the Catholic Church is the established church and can thus afford a certain lenience; in the religiously libertarian U.S., the church feels it must fight for its rights and be vigilant against all slurs.
Instead of simply staying away from The Miracle (like their Italian brethren), U.S. Catholics tried to keep other people from seeing it, and (as outraged citizens as well as deeply offended Christians) shouted, "There ought to be a law!"
*Especially (though Msgr. Galletto did not mention this possibility) so soon after the Assumption of the Virgin Mary became a dogma.