It's not insanity, it's genuine islam.
All religions have blood on their hands but this is:
Islam is not a religion, it's an ideological platform. Simplistically speaking, Islam has two faces, Meccan and Medinan. The Meccan face declares islam as a religion of peace, and used while this ideology isn't a major in their society. When ideology accepted by majority, they're slowly switching to Medinan form.
Anybody who sees islam as "just another religion" makes a fatal mistake. There are a lot of denominations of islam, learn the Quaran history and you will understand the difference between them.