May I suggest that, entirely accidentally, all this inconsistency enhances security?
The terrorist needs to know in advance what the system is in order to spot how to defeat it. He wants a high degree of certainty in that process. If the process keeps changing, and has no consistency to it, it makes his task that much more difficult. Now of course the tidy minds haven't designed the system that way, and the chaos isn't intelligent chaos, but it's better than complete predictability, no?
Sven