Re: How Superman Resolved the Issue of Zod *MEGA SPOILER*
Someone mentioned that this was war and sometimes in war you have to kill...
That reminds me...Wonder Woman is also a victim of this.
While Superman and Batman do not kill, Wonder Woman will! The reason why she is so vital to the Trinity is because she is the warrior who understands that people must die in war. She views Superman as naive...and Superman gets shocked and offended when she kills a bad guy. There is even a very important scene when Wonder Woman snaps someone's neck. Clark would not do it...and her philosophy is "Your naivety is dangerous...so get behind me and I'll win the fight."
By having Superman snap Zod's neck, you rob Wonder Woman of her equal place in the Trinity.