A prison is safe?
It seems like a prison COULD be safe. It suffers from being populated with criminals, and therefore having no underlying resistance to criminal activity, and being “policed” by what some might consider a slightly less-capable class of officers, who also probably don’t really care to keep the criminals safe.
But a police state also is a false sense of security. Apparently, some people will be shocked when the next terrorist successfully attacks our country, because they seem to believe that harassing people who take pictures actually will stop terror attacks.