They...don't? Pretty sure you can chalk it up to being a League of Shaodws ran prison. But I've pushed that thought aside at the moment, I'm writing the script on how they constructed the Batcave and all the bat gadgets without the secret of Bruce Wayne getting out to anyone. I am a joyless person and suspension of disbelief is not a thing that exists in my reality, so please forgive me if I don't have time to answer all of your questions post-haste.