A good friend of mine was visiting recently. We were discussing various topics, and somehow the topic of mormonism came up. She is not mormon. I mentioned that if she (or other close friends) were considering joining mormonism, I would have to speak up.
Now I need to give some caveats here. Ultimately, whatever decision my friends made would be their own. I would understand and respect whatever they decided. I do try to live by the "Live and let Live" philosophy. Yet with that said, mormonism and mormon theology is something I know quite a bit about. And being raised mormon, there was quite a bit I was not exposed to.
So just as if I were single, I would not date someone who was an active mormon, I would discuss mormonism with close friends who were considering converting to mormonism. I am not talking about a co-worker acquaintance who was thinking about it (which did happen, btw, long before I had searched out any former mormons on the internet). I'm talking about a close friend whom I respect.
This position is not a comfortable one for me, because I know and care about quite a few active mormons. I would simply share some pieces of information that I have learned, and allow my friends the privilege of following their own consciences. I would probably discuss various doctrines about race, gender and sexuality. I would also probably discuss various truth claims. Everyone (even now) is invited to also examine mormonism from a faithful perspective as well, starting at lds.org and examining the Book of Mormon and other publications.
And I would hope that any of my close friends who were considering converting to mormonism would talk with me first. I know that might not always be the case, and may be asking quite a lot. But I support open and honest information sharing. Mormonism does encourage a "milk before the meat" principle, which I personally do not think is fair to intelligent adult investigators.