The sad thing is, it was ultimately Zod who destroyed Krypton.
Jor-El had a plan for his son to become a bridge that would allow the people of Earth and the people of Krypton to live side by side. Zod wasn't willing to rely on the armor or to spend years learning to adjust as Clark did, so he decided to kryptoform the planet, forcing the conflict that resulted in the final destruction of Krypton.
He existed for one purpose only, to protect the people of Krypton, and instead he personally ensured their destruction. Whoever engineered him fucked up big time. Kryptonian engineers made a habit of fucking their planet, didn't they? Good thing Clark decided to go into reporting instead of engineering.