The latest story I've heard (who knows how much is true, sometimes this particular source I talk to is unreliable):
A group was cleaning the hall. The brother in question was using the internet (the Hall had internet?) and said he'd lock up when he left (was there an alarm to set? Did he know the code?) ((1914, probably LOL)). Apparently the hall has dial-up (again, the Hall had internet?) and the man had high-speed service at home but no one thought anything of it. The man was not acting unusual.
It was also thought that he shot himself in addition to accelerating the destruction of the Hall, as has been mentioned here.
I asked, "Wasn't he an elder?" Reply: "He used to be but because of his mental problems he no longer was."
I asked, "Do they know why he did what he did to the Hall?" Reply: "No, but apparently he didn't want the Hall to have ever been built."
I asked, "Why not?" Reply: "I don't know." (Witnesses typically don't ask important questions do they?) ((See "chronology, 607 vs. 587 BCE"))
The person I talked to said thankfully the story about the Universalist Unitarian Church shooting bumped this story off the national news.
Everyone was told not to tell the press anything because the Society had a person handling that.
The main thing still being that the Hall be rebuilt in time for its dedication.