Re: [WHY ARE WE HERE]
I don't know much of what's going on, so I probably shouldn't speak up, but... I agree with you. To begin with, if such an information isn't meant to be shared then it's dangerous to talk about it in the open— and that happening is not Monoceros fault. It's like Royal said, there needs to be some sort of system to guard these information.
Even taking that aside, logically speaking Monoceros going back to Mirror to tell her about everyone's part is counter-productive. Frankly, it'd be like asking for trouble from other teams, considering what's going on right now. And I don't think any of you is that stupid.
I am worried about her taking the information from you whether you share it or not, however. And I think that's what most people are worried about as well, rather than a lack of faith in your team.