The controversial fate of Jonathan Kent in Man of Steel had dire long-term consequences for the DC Extended Universe timeline. Zack Snyder's first Superman film made many bold creative changes to the DC superhero's background and his supporting cast. Snyder took a more realistic and grounded approach to classic characters like Lois Lane and General Zod and imbued them with complicated motivations to reflect the harsher world that this version of Superman inhabited. However, the most complex motivation came with the film's treatment of Clark's human father and how it led directly to a dark future for the DCEU.
Source：https://www.cbr.com/jonathan-kent-death-doomed-dceu-timeline/
