I think the problem here is a general lack of public awareness over wi-fi and wi-fi security. It isn't helped by most router manuals (and gadgets like the Nintendo DS) apparently recommending the insecure WEP standard over the much better WPA standard, and there are also some idiots who still think that Wi-Fi means magical free internet access for everyone with no one paying the bill.

It might help if governments and/or ISP groups included a standard leaflet with every router saying in plain english why wi-fi security is a good idea and how best to secure your connection. It could also explain the legal position in that country on using other people's connections.