Some mass murders have been done by Muslim jihadists. There are multiple examples. But others are being done by non-Muslims, and they seem to have something in common. They're done by people who have no history of engaging in mass shootings, and in some cases, no criminal history at all. Suddenly however, they go out and slaughter people who are doing no one any harm.
This was the case with Adam Lanza (Newtown massacre), the Las Vegas shooter, and now again with the Sutherland Springs, TX church massacre. So why is it that mostly law-abiding people (at least well below this level) suddenly commit such treacherous acts ?
With very few clues to work with, police are stumpted by these cases. Speculation comes into play (when circumstances fit). One thing that we could speculate is the possibility of Muslim jihadists being behind these mass killings, while using mind-controlled Americans to carry out the dirty work. Could it be these killers had no idea what they were doing, and were more like people transformed into robots in human form ?
A few circumstances exist, which point in the direction of this possibility >>
1. Few people have motive to mass kill strangers - but jihadists DO have that motive.
2. Using Americans to kill other Americans would keep the jihad killers hidden, and free from arrest, enabling them to kill again.
3. The mass killers had no motive for murder.
4. The past killers had profiles that would make it easy for jihadists (or other social nutjobs) to work on them, without interference from others.
5. Mind-control techniques (drugs, hypnosis, shock treatments, etc) could turn mostly ordinary people into mass killers.