Both radical religious people and mass murderers are all suffer from mental illness in my opinion.
Not really. Some people are more susceptible to indoctrination than others. I'm not even sure how radically religious some of these terrorists are. As Omni pointed out, it's awfully difficult to get a truck into a church or hotel room and kill scores of people with it.
Being killed with a gun in these countries:
Is about as likely as
dying of ________ in the U.S. Deaths per mil.
El Salvador Heart attack 446.3
Mexico Pancreatic cancer 121.7
United States Car accident* 31.2
Chile Motorcycle accident 14.3
Israel Building fire 7.5
Canada Alcohol poisoning 5.6
Ireland Drowning in a lake, river or ocean 4.8
Netherlands Accidental gas poisoning 2.3
Germany Contact with a thrown or falling object 2.1
France Hypothermia 2.0
Austria Drowning in a swimming pool 1.9
Australia Falling from a building or structure 1.7
China Plane crash 1.6
Spain Exposure to excessive natural heat 1.6
New Zealand Falling from a ladder 1.5
Poland Bicycle-car crash 1.1
England Contact with agricultural machinery 0.9
Norway Accidental hanging or strangulation 0.9
Iceland Electrocution 0.6
Scotland Cataclysmic storms 0.5
South Korea Being crushed or pinched between objects 0.4
Japan Lightning strike 0.1