The posters show the Pope in a pensive mood, with text in Italian translated thusly:
But anyway. Shame on the person or persons behind this. Think of the environmental damage of the relative loss of trees. Think of the danger to public health should someone sniff the glue used to post them. Think of the loss of income of the public servant who gets paid to approve posters in public spaces.
No, the ends don't justify the means. We are not Machiavelli.