A password doesn't equate to security.
It would be a lot harder to prove someone else used your setup when it's 'secured' with a password, but it can happen. Besides passwords being a piss-poor way to secure *anything* these days, many people choose stuff like their kids names, or birthdays or other crappy dictionary words.
What's worse, is a lot of people and places are still using WEP, which is useless in terms of accountability, but it would be enough for a court to say "You say you secured your setup but someone cracked it anyway? Yeah, right"
Nobody I know (corporates included) use a password like(lei3%dk&l[_#=3 anyway because it's "too hard" for users to remember.
Passwords are pointless for proving, or disproving, accountability.