Frankly I think the narrative has a strong anti-trust sentiment. The Game Company Murder Case (Chapter 116) and Reunion with the Black Organization Part 3 (Chapter 242) has Conan sharing delicate information with the police and nothing but death & destruction being the result.
Heck in the case of the former, Haibara (a character Aoyama feels he relates to, btw) says with a bandage on her face: "Don't you understand now? We can't let anyone figure out who we are. Anything that gets in their way, they destroy".
So until we witness a tragedy* occurring that would have been prevented with the cast being honest with others or we have some introspective moment about whether good intentions override all actions, I'm going to just go with the line of thought that the real motto of the series is "trust is bad, m'kay, so, if you trust others, you're bad, m'kay, because trust is bad. it can hurt your body, m'kay, cause trust is bad, m'kay..."
*Personally I think Kogoro nearly being shot by Gin proves that secret keeping isn't the perfect solution that Ai and Agasa for example make it out to be, but any good story would have someone pointing out in a response to the event "So you keep others in the dark for their own protection?" "Good thing Akai was nearby to keep Kogoro from biting it, huh?".
Even if the narrative actually isn't trying to validate the secrecy, it makes me feel like there'd have to be a blood bath that is the result of their secrecy (with no miracle to prevent said tragedy) in order for any of the protagonists to re-examine their stance, and even then I bet they still cling to the notion that secrets are cool, trust is for a fool.
The Mystery of Conan Edogawa
Arguably one of the best attempts at tackling the story of "Ran discovering the secret behind Conan". It's strong point is taking a common plot for Detective Conan fan fics and presenting it in a fresh manner such as:
- Touching on things that aren't dealt with in the show or discussed much.
- While there is some understanding towards Conan's predicament, the fic doesn't ignore the problematic approach he takes towards keeping quiet.
So, do yourself a favor and read this. I only wish I could so something half as decent.