Protecting people from being scammed is, besides what one can gather on their own, a community based feature, generally expressed through the Trust System and/or Trust flags and/or Scam accusations. If, as you say, you have strong compelling evidence of forum members that plan to promote scams, knowing that to be true, then by all means present it, with all the evidence you have. If your evicence is firm, it will probably be backed by others, giving more weight to the Trust valuation.