Peterson has a public persona and schtick, based on what stuck after throwing things at the wall a while. Now he's cashing in on that. Diverging too far risks putting his earnings at risk, even if he doesn't consciously think that way.

Pastors often fall into these ruts. They often want to help. The toolbox limits them, audience expectations limit them, their own financial needs depend upon telling people things that won't make them too uncomfortable, and their (ancient) world view has to harmonize with a (modern) world that doesn't fit.