Posing the question presumes the person asked is a partisan hack with no real principles.
Who left the fridge open?
The selective outrage is a good point. However, the fact that it was done in past administrations means it is simply a carry-over practice. The fact that it only goes back to the last administration is only because we don't recycle Presidents often enough these days. Prior to the Clinton administration, e-mail wasn't common (whether or not Al Gore invented it ). So the policy isn't likely to have changed until the Bush admin.
I don't have a problem with them having separate e-mails. My work e-mail is available to customers, but I don't give them my personal e-mail. Likewise they can call me on the phone, but I don't give them my cell phone number. Government people who work with classified information should have a secure e-mail that they can use to discuss it. Truthfully, how many e-mails do you think a cabinet secretary gets from the general public? It's probably a lot (depending on the Secretary. State probably gets more than HHS). They should have an address that's not available to the public so that they can get things done without responding to inquiries about the Presidential Time Travel Limo at Area 51.
Look I understand the implications of this story, and the hypocrisy that is the Obama administration, but wasn't the Press yelling at Obama for looking at their private emails? So now I guess they want to read there's. Huh funny!
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Americans are so enamored of equality that they would rather be equal in slavery than unequal in freedom.
Alexis de Tocqueville