Money see, monkey do behavior. Companies use it to sell us garbage and now people are killing each other because they saw it is something cool kids do these days.
Exactly how jihad is spreading and why it is so dangerous and unpredictable. They don't recruit killers and train them, no need for that. Just entice them to kill others, because many of them are already in shitty position. Ain't so hard to push man over the edge by promising them to be part of something 'greater'.
This will spread like wildfire.