Lack of power, Lack or water, lack of gas, Any one of these things will cause people to panic and go nuts. If you take away more than one thing and chaos is rampant.
A good bird flu can do more than just or two and that will send many back to the dark ages because they do not know how to function without any one of these things let alone all of them. I have shown my kids how to build a fire and collect food if need be. The water and other survival stuff will be taught if they wish as I let them make their own decisions there.