The smoking gun is the 22 emails the FBI won’t release. If they’re too sensitive to release - even “completely blacked out redactions” - then they’re unquestionably proof.
What many still seem to not understand: it’s not just that she had the secret content routed to her private & unsecured server, it’s that “YOU CAN’T GET HERE FROM THERE” with such messages without _deliberate_evasion_ of security systems. The fact that such messages were on her “private server” is proof enough that major felonies were committed “mens rea”.