It appears that there are insufficient hurdles in the US between having an idea to cause mass harm its execution. In countries with arms restrictions, the nece

It appears that there are insufficient hurdles in the US between having an idea to cause mass harm its execution. In countries with arms restrictions, the necessity to go the black market/organized crime to acquire arms appears to set a higher bar for people who want to be mass shooters and reduce the number of people who have the ability to plan and carry out such actions. In the US unfortunately, it appears that just about anyone, even with some past history of mental stability/radicalism is able to walk into shops and legally buy arms.