Justice League was not yet in play!

Anti-kryptonian not anti-superman, the necessity of such a measure is the likes of Zod and Doomsday and with big S out of commission and growing number of metahumans they needed a disposable squad to take care of one way missions.

I know just funny that you used that description. 😁 (t-o-f)

The 'timelines' I'm talking of is that there'll be a few movies before the next Justice League and they want to be able to have wiggle room with various characters. But you're on to something though, guess we should have seen more. 👍