As I'm continuing to study for my licensing exam, I came across some information from social psychology on persuasion. While logic- and reason-based arguments can be effective, so can emotional arguments, particularly fear. To make it the most convincing, the message much create a ton of fear, be believable, and include specific ways of avoiding the bad stuff.
Hmmm. Sound like anything that happens in Christianity sometimes? Like hell, fire, and brimstone messages? It makes me look at this message from John Piper even more skeptically.