What does matter is that there was no actual crime taking place by simply owning the art, and if the courts rule against him, there will be the creation of a new, unjust law.
"new" as in 6 years ago?
US Supreme Court Protect Act of 2003:
Sec. 1466A. Obscene visual representations of the sexual abuse of children
(a) IN GENERAL- Any person who, in a circumstance described in subsection (d), knowingly produces, distributes, receives, or possesses with intent to distribute, a visual depiction of any kind, including a drawing, cartoon, sculpture, or painting, that–
(1)(A) depicts a minor engaging in sexually explicit conduct; and
(B) is obscene; or
(2)(A) depicts an image that is, or appears to be, of a minor engaging in graphic bestiality, sadistic or masochistic abuse, or sexual intercourse, including genital-genital, oral-genital, anal-genital, or oral-anal, whether between persons of the same or opposite sex; and
(B) lacks serious literary, artistic, political, or scientific value;
or attempts or conspires to do so, shall be subject to the penalties provided in section 2252A(b)(1), including the penalties provided for cases involving a prior conviction.