but mom would have been more powerful without needing batman to freak out. the love for his mom should have been enough. "save my mom" that could have appealed so much more to Batman's human side.
Doubtful, at least from Superman's point of view. Just moments earlier Lex had claimed that "the mother of a demon is a witch" so I can understand Clark not wanting to play that particular card against ANOTHER guy who also hated his guts.