And that there's entirely too much history behind this to expect everyone to be rational.
This is in your head only. It's plain not true. We have, in the course of this quest:
1) Used a necromantic ritual invoking the name of a Neverborn to "better than hoped for by an actual god" result. No downsides
2) Gave Dresden knowledge needed to soulgaze an Infernal Exalted. No downsides, he got a revelation out of this.
3) Plucked Mab's full plan from her mind without her realizing - Dresden was a witness to this.
We have spent months working together with Bob and Harry by now. If Molly says to Dresden "my power says it's perfectly safe, and here's the theory behind why this is safe", yes, Dresden will believe her. He might grumble, but by this point he has pretty much accepted her as an actual authority on the subjects she is speaking about. He is not blind or stupid.
I have no trouble with using the potion on a as-needed basis. I just have IC and OOC objections to using it all the time.
I have mentioned some of those objections before on this thread, even before this vote.
@Yog will testify to it.
I will, yes. I will also say that to me your arguments read like you have come to a certain conclusion in your mind and are trying to work backwards to do everything to justify it.
People can be irrational, yes. They are all also functional adults that can talk to each other. None of the persons involved, yes, even Charity, is a hair-trigger nervewreck who will have a flashback episode or explode in rage or become completely incapable of being convinced that Molly knows what she is talking about.
And you are ignoring Molly's history in the quest. It has been several months since she exalted. Everyone involved saw how it changed her. She has mended bridges with Charity. She has involved Charity in an actual magical practice and has shown her Mercy in Servitude's effects. Mercy in Servitude, I remind you, is "you serve me, and in exchange your curse is held at bay" charm. It's a literal cult leader / evil overlord power. And Charity was ok with that. She interacted with ghouls and (I think) whampires normally.
Molly has built a lot of trust already. Her parents trust her to run a magical business to generate obscene amounts of money, and trust her to be responsible with that money. They trust her to held a number of demonic entities (ghouls, whampires, even if we discard cyber devils) in thrall for their protection and protection of others. They trust her to deal with elementals in the city underground. Charity trusts Molly to risk her life fighting side by side with MIchael.
And that's just other parents.
If we take Dresden, he put the lives of the council on the line by trusting Molly's insights into Thousand Hells to be accurate. He trusted her when she told him about Bane - a literal curse god. He acknowledges her as being a "god queen".
The image of Molly you think people have in their minds, is not the image of Molly I believe exists in their minds.
EDIT: Oh, and in a couple of months, Molly is going to be a God Queen of a whole hell realm. How are you planning to deal with this without some intermediate steps to build trust? This, if nothing else, is a necessary escalation.