You have the question upside down, slick.
What keeps all those folks packed in a small space alive?
Shut off any of it, and you get pressure.
/johnny
Exactly. Under the sort of pressure produced in such a situation, there would be need for anyone to give any form of order to initiate violence.
A wake-up moment for me personally occurred several years ago when I thought that my knowledge of gardening from my youth would guarantee me a successful garden in my current location. Quite a learning curve it was! Having the knowledge alone is not enough, as my successful garden today has come about by putting the knowledge I had into practice and learning from the results.