Because my text messages asking my girlfriend to pick up some food on her way back is of no interest to the public.

If, however, I am suspected of committing a crime, the police expects the whole untempered truth and anything else can be considered as obstruction of justice. If I can be held to this standard, so does our public servants in the government.

The government, however, has the power to hide stuff from the public. Leakers and whistleblowers are the only thing that can hold them accountable.