PA doesn't technically allow carrying into bars, they just do not prohibit it.
As for WI, we have "The people have the right to keep and bear arms for security, defense, hunting, recreation or any other lawful purpose." Yet we have a few places prohibited even though both state and federal Constitutions do not. It is because of laws that were created somehow override the higher law (Constitution). The Constitution does not grant rights, but rather reaffirms that right.