Mistakes happen.
When one makes a mistake, it’s shameful and it’s better that no one else knows of our weakness, right? We prefer to narrow down the information of our mistakes to the minimum.
And so we prefer private blaming over open communication, or public shaming.
When working with more people than me, myself, and I, keeping the information of anything to yourself will become an issue at some point.
But in some environments this is the promoted way. This is likely a good hint of toxicity.