Because it goes off the rails in 5 seconds. I believe in conspiracies. The odds of them not being overwhelmingly run by jews is pretty slim. Exterminate the jews? Uh, no. It doesn't really need explanation. Should you exterminate white people in the off chance the shoe goes on the other foot? Should it damage our relations with white-person country? It's fucking stupid is what it is, and it's obvious.