My point was not that TV/Movies are causing violence but are they fuelling it? Of course violence existed pre TV and film however is it becoming more commonplace? Would even include violent video games in the discussion.
A lot of people seem to laugh at the idea but the study in America shows a correlation between aggressive behaviour and time spent watching TV, among teens and young adults.
Young people idolise celebrities whether it be super heroes, footballers or actors and even social media celebrities nowadays. And they are certainly influenced by people they idolise. What if they idolise characters from TV/media that are violent?
Now that I've had much mirth at your sweet innocent life viewpoint, let me just put it into perspective. I could have mentioned any of the logical points above ('life imitates art imitates life' was my first thought, but I wanted to inject some absurd humour here!), but the real point is that, as also said before, the percentage of TV affecting violence is MINUSCULE and is something bent to proof a point for whatever purpose.
There's no recorded proof that say Pete on Sidmouth Street who gets 'triggered' by Captain America taking on Hydra and Bobby from Hector Ave on the street next to Pete is 'triggered' by the same thing. Even if that's the case, what are the chances both act upon a violent impulse out on the street? No visuals compel an individual to act; you literally have to have the 'trigger' mechanisms in you to act, which means ANYTHING can tip you over. It just needs the 'perfect storm' for it to happen.
But, of course, there's always the grain of truth that this does happen, but it's a grain, a pebble ripple in a vast ocean.
Your argument is based on a multitude of factors that you overlook; peer pressure, mob mentality for gangs. Mentality disorders, physical abuse etc for individuals.
TV doesn't need to trigger these people, but they may get some ideas from what they see and even then, this is not a mass issue, but in certain cases a leader influences the mob.
This again, dilutes your argument.