The man was mad, simple as that. Combined with the laissez faire gun laws in the USA, this is what happened.
I am sure if somebody is that mad however, you don't even need a gun.
Michael Ryan did because he attacked fully grown adults, but take that sicko Thomas Hamilton. I am sure I could go in to an infant school and kill the entire school with my bare hands without the need for a gun.
Violence and gore have allways been a part of entertainment. Look at the classic Greek and Roman writers. Homer was hardly Floella Benjamin was he? And also the entertainment. Being thrown to the lions, Gladiator fights and a good public hanging were the Coronation Street of the day.
Even the Bible is violent in parts, the flooding of an entire civilisation for example.
Taratino does not creat madness, people are just born mad.