Imagine the scenario: You are on a packed bus and the passenger behind you kicks the back of your seat. You turn around and politely ask him to stop. He doesn't stop. He keeps kicking the back of your chair. What do you do?
You can't change seat and you have an hours ride to go.
If you confront the man more fiercely, you risk not only a fight but a criminal conviction - which could lead the loss of your job, your house, your freedom etc.
You can't call the police for such a minor thing, and the bus driver wouldn't want to intervene. So what do you do?
I propose a 'dickhead' defence. In situations where you have "clean hands" and you have given the offender ample opportunity to disengage in his unsocial, offensive behaviour, you can attack him without fear of prosecution. He has broken the social contract to behave, therefore his body becomes forfeit. You simply tell the police "He was a dickhead" and you are free to walk away - following police investigation of course.
As long as you don't go overboard, I don't think the police should get involved. A small amount of fear is good for society. If you step out of line, there is a chance you will piss off the wrong person and get hurt.
Other possible scenarios:
- Man refuses to pay for bus fare and holds up the entire bus as the driver can start with him on it
- People who talk in cinemas
- People who try to cut in a queue