“Saving the world” recently has meant being involved in wars in Afghanistan, Iraq, and now Iran.

None of those have brought me a feeling of being part of saving someone.

Preventing the number one sponsor of terrorism from getting a nuke absolutely saves people. Even if you don't like the externalities of it. Or is the HN crowd still believing the "we just want nuclear energy (with highly enriched uranium)" story? I genuinely don't know. Humans have a near infinite ability to stare at the sun and insist it's dark, so long as it supports their world view.