But it's work to prevent armored cars (often diesel) transporting cash. Or potentially large portions of banking and minting systems which as a whole expends pl

But it's work to prevent armored cars (often diesel) transporting cash. Or potentially large portions of banking and minting systems which as a whole expends plenty of energy. You can't just look at the cost without weighing the benefit. You could say you don't think that is likely to happen, but spending energy to attempt to save more energy down the road isn't a clear mistake– it would just be a failed ambitious attempt to reduce waste.