^^ I guess you didn't get the point I was trying to make.
Lets say that the Admin or you yourself take charge of getting ID Proofs from the members and put a colored dot in the members post header. For anyone seeing that dot, it would mean that the user has provided ID proof to you which you have checked and marked the user as a user whose identity is verified. Essentially you/Admin are vouching for the members identity with that dot.
If someone deals with that guy and the guy turns out to be a fraudster who had produced a fake id, Who would the victim hold liable. Surely the person who vouched would be held liable in addition to the culprit. Would you or the Admin be willing to take that sort of liability? If you don't want to take liability, then there is no point in all that exercise, because there is no way a user would give any sort of importance to that dot if the person who put it there is not willing to take responsibility.