The reason that such large wars haven't happened is that people who get to be rl leaders are generally (A) sane and (b) caring about their people.
The president of the GVH is, for example, insane. He believes that the GVH once ruled the world, and that (given enough dealmaking and warmaking from him) it one day will again. Not something you'd ever get in rl.
Suits Mao Zedong perfectly.