Take action to corrects this problem by requiring people to verifiy their age or remove the offending images or I will be forced to report this site for violations of the law. You have 72 hours to take action. If you want to expose yourself to $50,000 fine and/or 6 months in jail its your choice. It should be noted that the posters might be just as liable as the forum operators.
You need to be freaking banned, it's one thing to point out possible illegal activity that can get the site into trouble, but threatening the site operators to "turn them in" and issuing a deadline/ultimatum, just shows you don't appreciate the community. IMO, u need to GTFO..