Great response. You're not fully resolving the potential skepticism I identified, but that's impossible anyways. What should be ultimately convincing is that good theories generate good predictions, and you should expect good theories to be connected to other good theories.

Unfortunately, I think a lot of people are firmly in "conspiracy-theory territory" already and aren't consistently testing their beliefs. I can sympathize because I know I spend a lot of time generating and trusting weak theories about, e.g. other people's motivations, my likely performance on a particular project.