The aim of propaganda is to persuade people to accept certain ideas or feelings or attitudes. The aim of science is to discover the truth about the world. The propagandistic aim is usually best served by being thoroughly one-sided, by presenting only what is favorable to your case and suppressing all that might weaken it and bolster your opponent. As Hitler remarks in one of his shrewd chapters on propaganda, you don’t sell your brand of soap by pointing out that a rival brand is really just as good.
