• It thinks for others. Often people will accept information they can't verify personally as long as they consider the source an authority. Others might be too busy to think things through or are uneducated and willingly accept convenient simplifications.
• It's concise. Simplification seems to go directly to the heart of the matter, so the propaganda's target might not even consider that there could be another answer to the problem.
• It builds ego. Some software developers are reluctant to believe that areas outside their own specialty are difficult to understand. For instance, a colleague who specialized in programming languages told me that there was no need to hire software engineering experts to teach software engineering courses because "anyone that has ever written a large piece of software should be qualified to do so …" Yet this same colleague would probably have a heart attack if I expressed interest in teaching an advanced compilers course. Simplifications reinforce the ego of targets whose expertise is in other areas because they reinforce the idea that these techniques or approaches aren't actually beyond their understanding.