Defaming Government?

So, they say defaming government is a crime? I wonder, in a real American court of law, what the attorney might say to support such an allegation concerning defamation. Last time I checked, government was not a person. In America, we at least have laws seeking to protect the American people from the American government. I have never heard of this alleged crime concerning defaming gov.

Secrets

If a Vietnamese can't take pictures inside government buildings, then they should not be allowed to be in those government buildings at all, in the first place. Why are people allowed in those buildings? That would be my first question. Because if you take photos of what is in those buildings, then more people can see. But why can't those people who see the photos not go to those government buildings themselves? In other words, if it a matter of national security, then there is no national security because people can go into those buildings and read the secrets and then leave with the secrets not inside cameras but inside their brains.