She did give a reason for it, namely that she had to do it because she was so important that the mafia surely would have lynched her so she had to do it before they got a chance to kill her. Which is horse trout. She did it because she's a scummy scum sucker and she knew she could take out a townie for free before she gets caught.

I would go as far to say as a vote for anyone that isn't Weaver today would be hugely detrimental to the town. Regardless of what her role is, literally all she has done the entire game is go out of her way to incriminate town, disrupt town and generally do anything she can to try and get people to buy that she's a cop and let her survive. She doesn't care about the town one bit and has put herself first at every single turn. I mean there's still some discussion, probably valid, that some of the inactives are mafia. imho though inactive mafia are less dangerous than purposefully selfish "townies". at least the quiet mafia are sticking to their hole and not confusing everyone else. Weaver is out for herself, and if she's out for anyone else they're probably called Big Sal. E, Tony Two Hats and Luciano.