Well, I was thinking that some of the comments here were a bit odd...but then I went and read the game thread! Guess that is directed at me.
To answer the question, I have had baddies confess in the topic thread. In games I've played I've seen players commit suicide (which is why I prohibit that in my rules).
I usually don't like it when a baddie gives up and confesses in the topic thread. This is usually when the baddie feels that he or she is caught and things are totally dire and that it makes no difference. I don't like it because the baddie is usually part of a team and it damages the team. No matter how certain it is I've seen baddies who played it cool get out of dire situations. Someone decides that the baddie is innocent or, in a complex game, the baddie is saved by some other mechanism (for example, in some of my games there is a governor who can stay execution and I've had the governor stay the execution of someone clearly -- I thought -- guilty. However, even a clueless governor won't likely stay the execution of someone who has confessed).
In this case, I am a bit startled by okamotosan's confession. While I had made an accusation in groupies (based solely on logic and reasoning and nothing else), I wouldn't have thought many people were going to necessarily believe me. After all, I'm evil.
So, okamotosan would have been better off just shrugging off my comments as those of a baddie.
One other thing... in early games that I was MC in, I actually had a rule that baddies could not reveal their role publicly as I thought it was too damaging to their teammates. There did arise a couple of situations though where revealing the role had a strategic benefit (that situation does not apply here though).
Anyway, innocents best chance here is not to buy into okamotosan's suggestion, but rather to kill her so as to eliminate one nightly death.