Many people, so polls say, think that Israel is a danger to world peace and often go so far as to conclude that the state ought not to exist. Some of these, in Europe especially, are classic anti-Semites who cannot live with the novelty of Jews responsible for a country of their own. But there is more to it than that. In the first decades of its existence, Israel was widely admired as the national refuge which Jews deserved and an egalitarian society as well. The Six-Day War of 1967 was the turning point. The Soviet Union and its clients,...