[throwaway_9168]

Well, unlike other lowly developers, FB engineers know exactly what is and isn't the right kind of mistake to make in pursuit of a company's vision.

Someone who works at FB even came out and said so:

"Remember, what Facebook is doing has never been done before. There are going to be mistakes."

https://news.ycombinator.com/item?id=19321420

So yeah, I think what that person is saying should be translated as:

"Please don't think twice about punishing rank-and-file FB engineers. We are so competent, all our mistakes have only been intentional ones."