If one of them ever draws blood, the others will peck at the blood until the chicken dies. Some chickens will fight over anything. You can throw something shiny in the pen and they will all run and fight over it until they've all had a taste to see that it's not edible. If one wants it, they all want it. They can walk over it all day and then one decide he wants it and they all want it.
People have to have food, and some compete with others for it.
It's awful, the way some people carry on in the woods when more than one person has shot a deer or an elk. They will kill each other over a piece of meat. It's obvious that people fight over money 2. But have you noticed how they also fight over baseball cards, football cards, and many other things 3. As long as nobody wanted baseball cards, they were simply trash 4.