The Muhammadan terrorist group Al Qaeda publishes a monthly digital magazine called "Inspire." There are regular features in each issue, like how to do maintenance on your Makarov pistol, how to commit mass murder with a rental dump truck, that sort of thing. After they published the truck murder story there was a spate of attacks done by running some sort of large truck into people assembled in public in large groups, all following some of the details of the "Inspire" advice column.
The one issue I saw that gave me to know just how depraved these monsters are was the issue offering advice to the aspiring homicide bomber on how to explain to his mother that his plan to blow himself to bits so that he might kill some innocent infidels was actually a good thing.