One has to wonder if Nacy Pelosi and Martin Omalley are also forbidden to go there and if not, why not? Is supporting the murder of the unborn not as bad as running naked?
"Obama gifts Nancy Pelosi with rosary beads from Pope Francis"
"The Washington Times - Vice President Joseph R. Biden and House Democratic leader Nancy Pelosi both received Communion during the Mass to celebrate the installation of Pope Francis in spite of their pro-choice position on abortion."
"It is with great joy that my husband, Paul, and I met with his Holiness, Pope Benedict XVI today. In our conversation, I had the opportunity to praise the Church's leadership in fighting poverty, hunger, and global warming, as well as the Holy Father's dedication to religious freedom and his upcoming trip and message to Israel."
I'm sticking my neck out here, but I guess if they bared their breasts or any other primary or secondary sexual characteristics, and then snatched breakable statuary and started yelling idiotic slogans, they would be similarly banned.
I don't think the Vatican police have any real way to screen people in the public square as to their comparative worthiness, unless someone actually starts stripping and yelling.