1. i'm giving you the benefit of the doubt that these are all typing errors rather than grammatical incompetency.. could you please pay a little more attention so that others aren't pained to read through three paragraphs of broken english?
2. if someone knows so little about wireless networks that they can't even follow their manual's instructions of setting up a password, then they really shouldn't be bothering with routers and wireless cards at all. would you build a house if you didn't know how to attach doors?
3. if we (more specifically my fiance, the tech-geek of us) catch people on our network that aren't supposed to be there, you'd better believe he'll use it to his advantage and teach them a little lesson - especially if their dumb enough to get onto our network AND leave their computers wide open. now, certainly not as severe as crapping on their boot file, but reading their packets and putting something on their hard drive? absolutely. again, my point: don't mess around in things you're not familiar with (whether setting up a wireless network, or hijacking someone else's).
4. as for the legalities of joining an insecure network, many have already pointed out that it is in fact NOT illegal to do so, and honestly, even if it were.. do you really think someone will prosecute for it? furthermore, do you think someone that can't be bothered to password-protect their network will even have the know-how to FIND OUT someone else is jacking their bandwidth??
get off your high horse of ethics. sorry, but dumb people are taken advantage of all the time in this world (loans, buying new cars, lending money where they shouldn't, fraud, break-ins, scams..the list goes on).. why would wireless networks be any different?