My point with all this "bla,bla,bla" is that we´re mainly discussing "violence" as we know it from our civilized, organized, supervized with police and courts... the places where we usually carry on with our lives.
We're all discussing it from wherever we carry on our lives, and whatever our life experience has shown us. Even with the best of intentions, it's hard to speak knowledgeably about situations that you've never experienced; those who do speak about such experiences are usually blowhards and not knowledgeable. If there's a lesson there, perhaps it's that we need to be cautious about making broad assertions and sweeping generalizations about the nature of violence, current trends, "kids today" etc.
With that said, I would cautiously offer the very broad and sweeping generalization that it's always
easier to destroy than it is to build, and it's always
easier to disrupt peace than it is to create it. An American politician (really more properly called a statesman), Sam Rayburn, once said that any jackass can kick down a barn, but it takes a carpenter to build one. And acts of building, mending, and making peace tend to be subtle and much more easily overlooked than acts of destruction and disruption. So no, I don't think we live in a world that's becoming more violent. We live in a world where violence has always been cheap and easy to come by, compared to peace -- as it has always been. We live in a world where the work of civilizing the young is challenging and takes patience and persistence -- as it has always done. We live in a world where uncivilized people, grown to adulthood and empowered with adult privileges, can wreak havoc -- as it always was. But we also live in a world where the tools of civilizing -- reading, writing, exchanging ideas -- are more easily come by than at any time in the past. Those who would build rather than break, the lonely voices of peace, are perhaps less lonely than in the past (or at least less alone). This doesn't make the work of civilizing any easier -- it is still just as hard and must be accomplished one person at a time. But we have some better tools and at least we can know that it is happening in many different places.