Accountability List: If something gets broken, somebody's going to pay. The Accountability List concerns exactly which somebodies that will be. True for gift shops, true for societies.
1) Make them.
2) Update them frequently, as necessary,
3) Implementing them is always up to the owner. Nothing says you have to wait until All Hell Breaks Loose.
4) Implementing them sooner, rather than later, may actually prevent All Hell Breaking Loose.
5) Whether it does or doesn't, it will always tip odds more in your favor. If you're in a fair fight, you really screwed up.