Is making use of unprotected Wi-Fi stealing?

This made me think of this Leo Laporte caller http://www.youtube.com/watch?v=S0zt4opqL18 :) Personally I disagree with the author’s stance on the unlocked door analogy. The author argues that there are no physical characteristics to identify a wireless network’s ownership and a default ssid with no security can only mean that its intention is for public use. I argue that unless the user specifically knows the intentions of a particular wireless network then they must by default assume that it is a private wireless network regardless of the ssid and security used. Using the unlocked door analogy if every house in a neighborhood was the same color and had their doors open does that mean a person should by default assume that every home is for public use?