Come on man, you can't be this thick and actually believe yourself a conservative.
If I fall down on your drive way, you are liable for my injuries. If I am attacked on your property, you are liable for my injuries.
The reason for "banning" guns is that the property owner has the right AS A PROPERTY OWNER to set rules and conditions for your access and continued presence in his property.
How about if my skin is black, and you require that people have white skin before entering your parking lot?
Your arguments sound a lot like the segregationists in the South. By chance are you a former Dixiecrat?
This varies from state to state. Under common law, the property owner is only liable in cases of extreme negligence.
The courts and legislatures have expanded the scope of liability, resulting in some people enacting anti-gun policies. That is a de facto gun ban by the state.