Like everything else, its an idea or set of beliefs. And as such a book of that nature clothes the idea in a intellectual argument. And to some extent, its better to have the ideas out in book form rather than just be floating around in some minds in some underground form that can't be as directly addressed.
To say only Israel has people that nutty is totally absurd. All countries have some forms of Xenophobia's and myths of racial superiority to condone the most vile of acts. But sadly the book our OP cites does justify a small but politically powerful set of Israels in the settler movement and the ultra Orthodox. A kind of Israeli version of the Taliban. But unlike the Afghan Taliban, I doubt the settler parties can ever take over a nation like Israel.
But sadly ideas can never be killed, and forcing them underground causes them to spread more readily.
But at the same time the USA has more than its share of nut ideas, right now, on anand tech we have threads on draw Mohamed day, a pastor in Florida ready and willing to burn Korans, we are unwilling to build a Muslim mosque to go along with other faiths at the 911 memorial, yet too many us expect others to see the USA as a
a religiously tolerant nation.