I think most of the participants in this discussion have expressed the opinion that we (humans) are responsible for the violence in our lives and in our universe. The question is where does it stem from.?....biology, culture, social/political philosophies, religion, dogmatism...all play a role.  

The consensus, thus far, seems to be

that violence is innate and therefore we resort to it so readily. I am more partial to this conclusion. However, I disagree that it is so because we are supposedly made in the image of the Patriarchical Deity of the three revealed Books. Man is not a mirror image of it's "so -called  Maker". If anything, the Maker is created in our image. Man has invested the "so-called Maker" with the petty attributes like jealousy, vengefulness, anger, etc; along  the noble ones like benevolence, forgiveness and so on. Therefore, the "Maker" is the mirror image of Man.  

In the end, we are responsible for our actions. I would like to throw in a thought that since we have created god/s in our image, we are responsible for his/hers/their nature too?