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I have no argument with this, especially the hilited part. Of course that is completely impractical. That is why those in charge of fighting the fire should be very wary of putting front line firefighters in danger.
Why is my statement completely impractical? There are many people who volunteer to take high risks to save or protect cultural artifacts, or even objects with much less societal meaning. You yourself allude to fire fighters. Firefighters battle fires in many cases where there are no human lives at risk except the fire fighters' themselves. And firefighters are very knowledgeable about the risks involved.
Law enforcement officers risk their lives to protect property, not just people. Some archeologists risk their lives on dangerous expeditions simply to discover new objects of cultural value. I myself would accept a significant level of risk to my own life to save certain art work and I am not a very brave person.
Sure those in charge of fighting a fire should be and are cautious about putting firefighters at risk; yet they do put themselves at risk at virtually every fire. Risk is inherent to fire fighting and a balance is struck between the level of risk and the damage that the fire might inflict.