Bill Clinton may have knowledge that the Attorney General may not have. Hillary may have told him something. The Attorney General would have to remember though, that he has lied under oath before. I believe he should have been called in for questioning, because he might have been able to prove that she was in bed at 3 AM that night.
No, Bill Clinton should not have met with the Attorney General during the investigation of Hillary Clinton. Even if the meeting was for a valid purpose, it gives the appearance of impropriety. The public already has very little trust in the government and in the public process, and this type of behavior, which appears as if it is an attempt to influence a public servant, does little other than to enforce the perception of corruption at the top.
During the investigation of Hillary Clinton, it may important to keep a open and transparent path. Bill Clinton has influence in many political circles and during this delicate time of Hillary's campaign, he needs to be out of the picture. It is also important that Bill Clinton remain on the sidelines during her presidency.
I think it was very foolish of Bill Clinton to have met with the Attorney General, for whatever reason, during the investigation of Hillary Clinton. Surely, any right-minded, sensible person must have realised how potentially underhanded and downright fishy it would look? It should formally prejudice any future proceedings, or the Attorney General should recuse herself from any further contact with the case.