If you are trying to persuade, it probably means that a nuanced, multifaceted argument is probably going to lose out to a black-white pronouncement. This has policy implications as the article points out:
There are times, however, when this link breaks down. With complex but politicised subjects such as global warming, for example, scientific experts who stress uncertainties lose out to activists or lobbyists with a more emphatic message.On the other hand, one of the reasons I like to listen to Warren Buffett, for example, is also because he can distill complexity into something simple that I can understand.
So I guess, the knife cuts both ways.