I think you have made a mistake here, 4/6 users you listed have been banned, if you can't see it, you can install more BPIP utility, it is a chrome extension that was designed by a member of this forum. Just do a search with key "BPIP Extension", and when you install it, you can see a lot of essential information around a user when they post.

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As long as you take a moment out to report them, surely the moderators will care and ban them if they feel that it is correct. Don't worry about fairness in this forum, it is great!