Judicial review on appeal is de novo in the sense that “the trial judge should then make his determination of whether or not the harm likely to result to the public interest by permitting the inspection outweighs the benefit to be gained by granting inspection.” State ex rel. Youmans v. Owens, 28 Wis. 2d 672, 682, 137 N.W.2d 470, 475 (1965), modified on reh’g, 139 N.W.2d 241 (1966).