It's a reference to a silly story where the lesson is to not be a judgemental shithead just because someone else fucked up.

Yeah it's the bible. I don't care if God is real or not, nor your opinion on it. I also use references from the writings of Vonnegutt, the music Dolly Parton, and 90s anime.

Because you can get moral lessons from fiction. We do it all the time. My reference isn't even that deep. But somehow the ten word literary cudgel I bludgeoned you with still didn't make the point. It's a cautionary statement.

You are acting like the crowd of shitheals that wanted to stone a woman to death, just like in the biblical story. That's not a good look nor is it a good indication of your 'moral compass'. Sorry I thought you could infer that from my one sentence quote from a very well distributed piece of literature.