Bhagavad Gita, Chapter 3, Verse 24

If I did not act, these worlds would perish. I would be the cause of the mixing of castes, and I would ruin these people.

Opting out isn't a neutral choice when enough people are actually watching and following.

This extends the last verse to its real conclusion, quitting visibly doesn't just affect the person who quits. It can unravel the whole shared structure that depended on that example holding steady.