"Why is it necessary to have a site like this?"
Because it is literally a Lifesaver ! I will give personal testimony on this.
Shortly before I actually left, I sank in to deep Suicidal Depression, and came so dangerously close to ending my life. Loving people on this Site begged me to seek Therapy, which I did, but would not have, having still got the JW thinking on the matter, my Therapist was brilliant, she had treated a number of ex JW's, so knew what she was doing.
This Site aided my recovery no end, I was gradually, again with the help of many a kind Poster, to get rid of all JW thinking, feelings, and of course, beliefs.
It was, particularly in those days, a very educational Site, (use the Search facility) some very erudite people Posted, and taught me about the Art of Critical Thinking, directed me to great books to read, and really clued me up on lots of things that as a a JW you are denied.
So, from the bottom of my heart, thank you Simon, Angharad, and all involved,especially those lovely people who took the time to help me !