Why is it that young humans love to roll in packs? You see this in schools the world over. Kids love roaming around town with other kids, marauding and haunting. I think it’s because there’s safety in numbers. It’s hard to be the odd one out when you have a friend group that will have your back. It’s also because groups usually have a social organization system you can easily fall into. There is usually a clear leader, who calls the shots and sets the tone. Then everyone else falls in rank and file, waiting to be told what to do (under the illusion that they could be the shot-caller themselves). 

This gets less and less true as you get older. The group formations tend to fall away until you’re left with your own family unit, which is a pack unto itself. Then you get to watch your kids find their own crew, and the cycle continues.