And nothing else is. If nobody wants it, it's not economic production. He simply takes it by force. This is not productive behavior. If that property weren't seized, it could be put to private, productive use.
Government spending is also a net loss, although it increases the GDP just like an earthquake.
It subtracts government spending and taxing from overall productivity. Economist Robert Batemarco picked up the idea and prepared an alternative set of statistics that shows declines in living standards where the government wants us to believe we're richer. Instead of subtracting the supposed costs of economic liberty from the GDP, as the Greens propose, we need to take away the costs of government, including environmental regulations, which interfere with private property and cost hundreds of billions of dollars a year. As usual, then, the Commerce Department has it backwards. If we are going to attempt national income accounting, it should be an honest undertaking.