Sounds like Christian missionary's without guns and knives.
They are acting on a belief that they must spread the "gospel" of Islam throughout the world for Allah.
Unlike Christianity and the missionaries of that religion, they spread it through any and all means necessary to achieve it.
Tolerate Muslims at your peril.
Why must you always sanitize it?
You forgot:
Explosives.
Anthrax.
School buses.
Arms warehouses in mosques.
Ambulances as weapons distribution.
Mortars.
Rocket-propelled grenades.
Sarin gas.