There are sociopaths… who totally lack any consideration for others.
Then there are psychopaths… which is a lot more blurred, because people always jump the gun and slander people with the label.
Google defines it as:
a person suffering from chronic mental disorder with abnormal or violent social behavior… so in this case the shooter.
There is also criminal psychopathology… which is not that far away from viral pathology… or any other pathogen… that has a pathology behind it which studies how it managed to take effect in the sufferer.
So a psychopath… is actually a potential subject under criminal psychopathology. Meaning that they have tendencies toward criminal and they should be studied!..
It’s all the blanket of ignorance that many well intended individuals feel… good people who are well taken care of and stay away from drugs don’t do bad things… might be true… but it’s a very blurred line.