Then I think about Nazi Germany and the holocaust. I think about the tales now coming out of the Horn of Africa, wherein Muslim slavers are taking whole villages of Christians and animists and selling them into bondage.
I think about the radical Islamists who are running rampant in places like the Phillipines.
And finally, I think about the vitriol directed toward "Mormons" and other religions here on FR, perpetrated by the usual gang of suspects.
I believe you're right, and there are people in whose hearts Satan rages uncontrolled.