Not true. The wireless access point (WAP) granted the permission. To hook up to a WAP your computer sends out a request, this request is either denied via MAC filtering or other types of access controls, or it it granted. In this case, permission was granted via the WAP and he logged on.
That is like saying not locking my house or car door grants permission for a thief to enter and steal my personal property.
This should be cut and dried clear, the whole idea of “free” internet access or “free” music and movie downloads is helping to destroy the basic concept of private property.
When someone else is paid the bill, others should respect it. If they don’t it’s socialism.