Just for the records (haha!), if that requirement has the consequence to keep people with such records away, I guess the TOS won't be unhappy. It's not only about security issues for a meeting. Imagine the worst case scenario, someone freaks out and runs amok or commits crimes of gang kind.
Now what would be the media coverage if
a) that person were a member of the Catholic church? Well, they would report his membership, but not link that to the events. They would concentrate on the personal circumstances.
b) that person were a TOS member? WOAH, Satanic panic reloaded!
Of course, that is unfair.. but that's the reality out there.
Oh, hell, I do remember the Satanic panic of the 1980's in the US, when I was a fledgling teenage Satanist.