>>Can a Catholic tell us where in the Bible it says it is a sin to have nuclear weapons?<<
A Catholic can’t tell you that because it’s not there.
This is a personal opinion of that Archbishop. Unless it’s from the Vatican, it’s not a “Catholic” opinion. It’s the opinion of a man that holds an office in the Latin Catholic Church.
How is everyone to know this isn’t from the Vatican? It’s coming from an archbishop’s mouth into an official publication.
Are we to ignore all things from Catholic leaders until they are individually verified by the Vatican?