Football system

1. Without rules

1.1. Players would get hurt.

1.1.1. fight

1.2. Wouldn't know how to play

1.2.1. wouldn't know what players are doing

1.2.2. no fun

1.3. Teams can cheat

1.3.1. Coaches can pay the ref to cheat

1.3.2. play dirty

1.3.2.1. blindside other players

1.3.2.2. hit from the back

2. Protection

2.1. not much injuries

2.2. more safe