If you live in one of the cities where [www.craigslist.org
] has a bulletin board, you might consider posting a query/warning about this LGAT in the 'community discussions' listing. That way you can 1) warn others about this scam and 2) get further information in case someone reads your posting. You can arrange for your listing to carry an anonymous e-mail address. If anyone does respond, you can arrange to correspond through this forum so you dont lose your anonymity.
This sounds rough. Good luck to you. Key thing is you must keep your own sanity, or you wont be able to help anyone else. The best advice given is 'Keep the porch light on'. Dont try to argue people out of their beliefs, but indicate that you are still there to love them any time they change their minds and want to connect.