Any writer who believes in the 'lucky creative accident' in writing is pushing elephants on roller skates up greased ramps.
American traditions and the American ethic require us to be truthful, but the most important reason is that truth is the best propaganda and lies are the worst. To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful. It is as simple as that.