Hm, I'd say...
What has conquering territory and other countries resources been for? What purpose?
To use it yourself. So you can't contamine it for thousands of years because that oil will also be your gasoline inside the tank of your expensive car. Your food will also come from potentially contamined sources...
So that's why the nuclear answer still remains like some sort of "very last option to win the game". Things just have moved on since Little Boy...
No rich guy wants to suffer damage himself from his chessboard games.