A fool is often as dangerous to deal with as a knave, and always more incorrigible.

Someone acting in bad faith is at least predictable, since you can work out what they want and act accordingly. Someone careless or muddled is harder, because there is no logic behind the damage and no lever to pull, and correcting them requires them to see something they cannot. The harm from either can be the same size. The difference is that one can be negotiated with.

When something has gone wrong, work out which of the two you are dealing with before you plan your response. With carelessness, build the safeguard into the arrangement rather than into the conversation. Do not rely on explaining it better.