This is the crux. This letter is clearly very ballsy in a corporate context, I doubt there is a stack of similar memos in the Morton Thiokol archives which if a

This is the crux. This letter is clearly very ballsy in a corporate context, I doubt there is a stack of similar memos in the Morton Thiokol archives which if acted upon as a group would have bogged down the launch. But at a minimum, making this argument requires at least one similar example. Without that alternate case, languorous management is the most likely culprit.