No property is worth a life?
When did this idea first come to be considered a fact? Originally I believe it was meant to imply that a person should not foolishly risk their life for property than can be replaced. It did not mean that you should not protect what you own.
I would never risk a loved ones life for property. They are more valuable to me than any possession. However, the life of a criminal attempting to steal that property has no value to me. It has no value to society.
Example: my car has a value to me and society. It allows me to earn a living and pay taxes. A car thief has no value. He brings nothing of value to society.
We have taken a saying and twisted it around to mean something totally different that what it started out meaning.