Mass shooters who simply go "somewhere" to kill a bunch of "someones" they don't even know...apparently have "learned" to grossly devalue all human life.
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Any thoughts where they ever would have "learned" to devalue human life to that degree?
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I'll give you some hints: 
(1) Name me one Gangster in the 1930s who went to a big city with a machine gun and shot 500 people within 10 minutes. 
(2) Give me the total number of people killed by Billy the Kid and tell be if two high school kids at Columbine doubled his total...in one single day.
(3) Fewer criminals/people died in the infamous St Valentine's Day Massacre and the Shootout at the OK Corral - combined - than died at the church in Texas.
(4) Of the "Top Almost-30-now Mass Shootings" in the United States, only one - one - occurred before 1970. And the vast majority of them occurred in the last 20 years.
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The "insane" "learned" to grossly devalue human life and to kill innocent people. How did they "learn" that insanity?