We absolutely do need to see the judge's training materials. From my experience, judges are biased in any and every issue that relates to matters that have a gender-conflict component. Certainly, the most obvious example is family law, and everyone knows the entire legal apparatus (including judges) are biased. If the training materials reveal a feminist bias, it would explain a lot things. 

I would be willing to wager that the training materials for judges ARE biased in the direction of "feminist legal theory" and the real reason they don't want to reveal is that it will show that father's/men's groups have been right to complain for many years while feminist groups have been lying.