Well in one exchange, one person asked another if they would be willing to fly their family on a MAX plane, to which they responded no. And perhaps more importantly than the content of these messages is their volume. There's 100 pages of this stuff. This isn't an isolated case of disgruntled employees like you'd find at most companies. This is an entire project in which just about everyone working on it had something bad to say about it, and was acknowledged to be dangerous, and it still got rammed through.