Violence creates violence in some people. Hollywood and TV sells violence!
In the late 70’s, our PTA was trying to do something about this...apparently to no avail. At that time, it was established...by psychiatrists and psychologists, that even cartoons, watched by youngers, was full of violence.
If kids watched a cartoon character getting run over....flattened...or apparently killed....and then getting up, to the children, it meant that humans will do the same. In other words, they could not differentiate between cartoon characters and humans.
An interesting study...
Cartoons in the 1940s were much more violent than they are now.