'Cause there's so many products for Java that it would be a full-time job to make forums for each of them. Any time a product gets so popular that messages for that product start crowding out the forum it's being discussed in, we make a new forum. If you can't find a forum for the product you're interested in, the place to go is usually Other Java Products and Servers. For open-source products which haven't yet established their own forum, go to Other Open Source Products.
Science is the process of replacing what we "know" with what is TRUE. Politics, alas, often prefers to be the opposite.