Would you do it?

I have an internet stalker. They searched the internet to find out whatever they could about me, then began posting it here. None of what they found was damaging or personal, but this person is very racist and very cruel to disabled children, so they have posted horrible things, and not just about me. It took Yahoo months to delete it all. Meanwhile, I am a competitive person so I went hunting as well, and found evidence of some fraud and stealing that they neglected to cover up. Should I go forward with it, or just pretend I didn't see it?