Because those statements might not protect against a really good tort lawyer?
Because you want to make your parking garage safe for the little old ladies walking to their cars?
Because most insurance companies give discounts for putting up video surveillance?
etc.
And having a video that says "Look! It's easy to steal from our property!" would?
Because you want to make your parking garage safe for the little old ladies walking to their cars?
Camera's don't make a property that much safer. They just give the police something to work with after the crime is done.