It doesn't have to be open.
> There is no excuse for any network OWNER to have a network open to access by strangers.
Apparently, you aren't aware of the plethora of wireless encryption cracking tools out there that can get you connected to an encrypted network in minutes a lot of the time. The truth of the matter is that knowing it came from your network, even if it's a generally well-secured network, is no guarantee that some malicious party has not managed to get access to your network. More to the point, it's not proof that you a person who leaves his car keys in the ignition is accountable for the use of that vehicle.
It's clear we won't agree on anything here. I find that idea completely ludicrous.
edit: My girlfriend just made an interesting point. Basically, your argument extends beyond me and my wireless network. Your argument essentially states that if some pedophile cracks encryption on my wireless network at home and distributes kiddie porn over the Internet, his culpability is transferred to me by way of my wireless network, then to my ISP by way of the Internet connection it provides for my wireless network, then to the stockholders who jointly own the corporation -- which might include you, if you have a retirement investment account.
