...but might I inquire what it is you are trying to hide?
kinda defeats the purpose if he tells you...
Q: Why was employee 6 afraid of employee 7?
A: Because employee 7 was one crazy m@#$#% f#&%#*!
Freedom of Speech, you either have it or you don't... Although, I suppose this particular case is a little sticky. Do you think that when people are actively trying to avoid law enforcement, their speech is still protected? I side with the idea that it should still be protected. If someone posts a list labeled "100 best places to drop dead bodies off where they'll never be found", I don't think they've done anything wrong. At least not by posting the list, their research methods may be in question.
I suppose if it turns out that the tweeter is in fact a cop then they have all the right to fire him as I'm sure it is a breech of contract. But otherwise he/she should have the right. Johannesburg just needs to find better methods and stop their internal leaks, don't take it out on the messenger. Of course, I don't know what the actual laws of Johannesburg are, I'm just considering what they should be.
When it comes to national security, nothing is sacred, unfortunately.
Seriously, you just came out and said it out loud? You don't even bother to hedge or attribute the statement to "in times of war" or something. Well, I will admit your bluntness is refreshing, and in turn I will be just as blunt. I disagree with you 100%. National security is not our one and only core value. Many, many other values must come first. This is especially true when you are only talking about a _potential_ threat to national security not even a fully realized one. Anyone who believes otherwise doesn't deserve the freedom and benifits of a modern society because they have a barbaric mindset.
He has not acquired a fortune; the fortune has acquired him. -- Bion