I read once that when Genghis Khan entered Khwarezm he was deeply offended by the sight of its canals and ordered them all torn up. Rivers, he felt, should always be free.
I could take a few moments to verify this with an Internet search or, even better but more time-consuming, going downstairs and looking through my library–I’m sure I still have that book, since I generally don’t throw books away and I don’t typically borrow books (because then I have to give them back, and I want to keep them on my shelf for those rare but vital occasions when I need them again). But that is irrelevant for the sake of this thought exercise. Let’s assume he did just that and go from there.