This can crop up when working in-house or with clients. That horrible feeling when you know what is being suggested is just plain wrong! In the professions strong minded people are tough to deal with. A key skill set for Communications professionals is gentle persuasion and delicate coaching.
But it seems to me that a large part of success in PR, especially as practitioners get more senior, is educating others – both people in your own organisation and externally – about how public relations works and what level of quality and resources are required to achieve success.