violence

We all live surrounded by some degree of violence. Who has never been an innocent victim of it? But, perhaps, as we see it everyday, many common people have also become more aggressive than before to some extent.
This video shows widespread forms of violence, which frequently involve young people. Does what it shows also happen in our country? In the same way? What are the reasons for this, in your opinion?
And, on the other hand: do prevention campaigns work? A few days ago Juanes organised a concert for peace - not his first - and he was threatened because of that. Is it any use to ask violent people to reflect on their behaviour and change?