Hi ABC,
Glad to meet you! You asked what is the purpose of this board. I can't speak for the owner of the site, but I'll tell you what I've found.
This is a place where Jehovah's Witnesses can be completely frank and honest about their feelings, doubts, opinions, etc., without censorship or reprisals as might happen at the Kingdom Hall.
That's why you may find some negativity. For instance, if I have a doubt about the WT teaching on evolution (which I have), I could NEVER express that in a group from the Kingdom Hall or out in service or privately to friends.
But here, we can have freedom to air our deepest feelings about all these kinds of things.
I hope you find this useful.
Warmly,
Pat