Also, I've listened to "security" at military bases before. There is nothing ever said over the air amounting to anything of concern anyway. For the most part it is all routine traffic as officers make their rounds and reportings of such rounds, traffic issues, meetings and other low priority stuff. DUH.
So then if something major happens, possibly involving a hostile act, how are they going to communicate?
Just because you've heard what you deem to be mundane traffic whenever you've tuned them in, it's rather silly to assume that if something major does occur, the initial responding forces are just going to magically use some other, secure radio system.
Dispatching units to a silent burglary alarm at the BX over the standard, non-secure radio channel can amount to something to be concerned with, because if it's a valid burglary in progress, the bad guy(s) with the scanner have now been tipped-off that the security forces are on the way. That in itself is bad. Hopefully the bad guy(s) would use that tip off to flee the scene ASAP, instead of setting up ambush plans for the responding security force personnel.
I'm not saying the publication of security freqs is good or bad (it's their duty to protect their communications), I'm just making the case that your reasoning in the matter is pretty lame.