Basically Rabbi Sacks gives the PC view that all 3 Abrahamic religions have violent tendencies.
He explains that later sages in Judaism and Christianity later mitigated these violent passages after catastrophes. The Jews after the Roman revolt which killed 1 million Jews, and Christianity embraced separation of Church and State "after the horrific religious wars of the 16th and 17th centuries." What about Islam? He blames it on their being a younger religion, not inherently more violent. He says it has DECADES of self-destruction warfare ahead. He believes eventually the carnage will teach Muslims what it taught Jews and Christians.
Nonsense. Decades? What evidence is there for that conclusion? His analysis is specious.
http://www.wsj.com/articles/our-brothers-keepers-1445296466 the review of the book
Why Islam=Violence today
Even if Sacks is right in his analysis, it is more likely CENTURIES. Meanwhile, keep your powder dry.