The world has always been violent and the connected world brings us the information much quicker. In the old days a volcano eruption in one part of the world will only be reported a month later because news gets carried by steam ship. Today it is the internet.
Further more violence on TV is just another way to desensitise us to violence for what may come.
yes the violent hasn't really increased, but we're just far more aware of it
To be aware there is violence is good, but to have it put in front of your face every second of the day is not good for ones psychology.