You steal it because you are nervous about there being no toilet paper next time you need it, because someone else has stolen it, because they are nervous about there being no toilet paper next time they need it, because someone else has stolen it, because they are nervous about there being no toilet paper next time they need it...

It's an example of a process that one way and another probably does more harm to the world we live in than anything else, distrust building on distrust till we're all ripping each other off.