This is because with his position in the judicial system, if she won people would say he had a hand in it, and if she lost people would make fun of him, saying he was ineffectual. With the prospect of losing either way, it is better simply not to fight such a case.
因為他身在法界，打贏了人家會說勝之不武，打輸了人家會嘲笑他沒用，這種橫豎都是輸的官司，不打也罷。