Yeah I don't know that this premise is true. For a lot of examples you might 
    give WRT war or security, I feel like some will take the approach that "if 
    you can't do it transparently then you probably shouldn't be doing it at 
    all".

If your enemy knows your entire plan of attack in a battle you will lose. This isn't theoretical it's just a fact. It's why military organizations invest so much in intelligence. Knowing what the other guy is planning gives you a massive advantage.

You could perhaps say "Well then you shouldn't get in a war". But that isn't really under your control. If someone else decides they are in a war with you. You are in a war. It doesn't really matter whether you wanted to be in one or not.