Wi-Fi mooching Analogy
One day, a passerby saw the wide open door and went into the house to enjoy the aircon. Just enjoy the aircon, nothing else. The owner didn't lose anything because his aircon is always on, regardless if there is anyone in the house or not. But he is not happy that some stranger is enjoying his aircon.
But instead of chasing out the passerby and locking his door, he decided to call the police to arrest the passerby.
So now that the passerby has been caught. But the door remain wide open.
Waiting for another passerby to come in?
Why don't you just turn on your freaking Mac Filtering Features? And also WEP or WPA!
Why the need to call the police and get that guy arrested? Did you lose anything?