I´m not sure wether there is a significant increase in extreme violance at all. We just get better informed over the years, and the population level is increasing. Thiese are the main reasons for believing of a more violant society in my opinion.
People had always killed others for almost no reasons, have abused children in all times of history, people have always wanted to simply hurt otherI believe that this is out from our society (not lack in education, but the education!).
The father who teaches his son that he never shall run away from a fight, the mother who agrees; in shool the boy/ girl gets the most attention that is able to frighten the others (due to physical or psychological violance). The movies in which violance is the only solution are new in a global context and don´t help at all, but they are not everything.
And another reason for violance is ,of course, determination. Some people really have kind of a violance gene and other don´t. Those who have this determination do not have to become violant, most can control themselves, some can´t.
(sorry for not writing scientifical here, burt I don´t have the time to look it up. There really is kind of a violance gene, I heard of it several times. If somebody has time could he/she look it up?)
