I like the analogy of a smoking gun, but I think it misses the point. The better analogy is this: we just found a kid carrying a gun at school, and you all are trying to downplay it by saying, "Well, she didn't use it!"
There should not have been classified information on her server. She
said there wasn't. She said there was a completely separate system for sending classified material, specifically designed so that that material could not end up "anywhere other than within that system, including . . . outside email accounts." She
explained that she was "well-aware of the classification requirements." Despite all this, classified material--including top secret material--found its way onto her server.
(Side note: the four classified emails found by the intelligence inspector general were out of a sample of 40. We're not talking about 4 emails out of 30,000.)