If you ever read Karen Pryor's "Don't Shoot the Dog", that's one of the methods for discouragement: first, reward the behavior [that you consider undesirable], and then gradually stop giving the reward. The subject's thinking is, "Why the hell should I continue the behavior if I'm no longer getting the reward for it?"
I run an open wifi network, and I certainly do collect and store the packets poor chaps are sending through. I have a good excuse though, anybody who tries to connect is first of all redirected to a webpage with a huge warning: "THIS IS A PRIVATE NETWORK AND BY USING IT YOU AFFIRM THAT YOU UNDERSTAND THAT THE OWNER MAY COLLECT AND STORE ALL THE DATA YOU SEND". :-b
> Let them know that you will be installing Parental Control Software
> so you can tell every place they have visited online,
> and everything they have instant messaged or written to
> a friend. Don't install it behind their back, but install it!
Mmmmm, sounds like a win-win situation: parents feel secure, software vendors are paid, and kids are unaffected whatsoever.