If Islam is a religion of peace, why aren't extremists extremely peaceful?

Brilliant book, really shows you the scary truth about the Qu'ran. Recommended!!

https://www.amazon.co.uk/gp/customer-reviews/R3VQGBLK8C8IV6/ref=cm_cr_getr_d_rvw_ttl?ie=UTF8&ASIN=0995584907