I post mainly to try to come up with something easy, observable and hard to explain away. When that doesn't work, I move on to the next idea. It's all about practicing your ability. I'm starting to see that certain things have to be accepted to allow the debate to continue. By barring government photography, you open the discussion to purely empirical or mathematical data rather than relying on the easy proof.
Imagine, if you will, always having to go into a debate with little or no knowledge about the subject. You'd get your ass handed to you if the other person had lots of facts and figures. This way we can't use easy references to prove anything, unless someone's done some calculations already. It forces the arguers to be more creative and original.