> We evolved in an environment where violence was part of real life and a real threat to our own well being
It's beneficial for survival to have some strong reaction on observing violence. Could be "charge", "run for your life", or something else, but it was never "click a mouse button and move on to the next violence scene". Similar for gore, evolutionary correct reaction is "run and/or vomit".
People who failed to react in a strong way did not pass genes: joined the violence scene they observed, caught the same decease and joined the gore scene they observed.
It's beneficial for survival to have some strong reaction on observing violence. Could be "charge", "run for your life", or something else, but it was never "click a mouse button and move on to the next violence scene". Similar for gore, evolutionary correct reaction is "run and/or vomit".
People who failed to react in a strong way did not pass genes: joined the violence scene they observed, caught the same decease and joined the gore scene they observed.