[R]equiring Pleasant Grove to erect a second religious monument would not render the allocation of public property and money to the two monuments neutral. The citizens of Pleasant Grove, and Utah in general, undoubtedly espouse a broad variety of religious views.... Displaying monuments that communicate the beliefs of only two of these viewpoints would not amount to an impartial distribution of public property.... And because there is a finite amount of space in Pioneer Park, allowing all interested groups to install their own religious or antireligious monuments in the park would be unworkable....
Because the government property at issue in this case is itself the message, it cannot be allocated in an impartial manner.... Summum attempts to use the neutrality test as a tool to facilitate the placement of its own proposed monument in Pioneer Park. It argues that the district court should order the installation of a Seven Aphorisms monument in order to establish an impartial allocation of public property towards religious expression in the park. But because the neutrality test does not apply in the context of public monuments, this tool is unavailable to Summum.
Justice Lee filed an opinion concurring in part and concurring in the judgment.