Humans being what they are, admins of open wireless networks should be canny and careful. In these modern times you can be punished for what other people do, no matter how tangential your connection to them. Presumably most folks would prefer not to go to jail because someone downloaded child porn over their wireless link, or spewed forth spams, or published information displeasing to corporate types. It’s a good idea anyway to have some controls in place to control un-neighborly behavior, like bandwidth- and time-hogging.
