Anyone with any sort of training handling classified or otherwise confidential information

knows the only time they're allowed to access such restricted information is when they've been given express authorization by a designated individual for that specific information.

Accessing that information in any way other than that is unethical, and in many instances, illegal.

Not when the firewalls or any other security measure are down.

Not to check on how vulnerable your data might be.

Not if someone else steals and publishes that information in another venue.

Not if a subordinate authorized to view the data hands it to them.

This is an absolutely basic principle of handling confidential and classified information, and someone at the Sanders campaign absolutely failed to abide by it.

That's not the Clinton campaign's fault, not DWS, not the DNC, and not the vendor. Someone with that sort of access should have enough integrity to not break that rule.