So why did you film if filming is prohibited?
Perhaps since it was a public building and apparently the sign was inadequate in that it didn’t quote the statute making it a legal rule; either way it should have resulted in a polite “please turn the camera off” request, not jail ... I’m willing to bet there is a security system recording away in that building right now... shouldn’t the head of security be jailed?
From what I have seen in my 42 years of life legitimacy is NOT a feature of government.
city governments and city hall are a weird collusion of cops, courts, attorneys, bail bondsmen, tow truck operators and politicians. The politicians seem to have relatives who are cops, tow truck operators, bail bondsmen and attorneys.
All this goodness packaged into the nicest building in town.
So let's not pretend that legitimacy flows from city hall. We are not children after all.