Actually the data is very conclusive that exposure to violent movies/games raises levels of aggression (in young adults as well, not just children). It just isn't widely believed.
It shows there is a correlation* between the two, not that one causes the other.

*The correlation from your graph maxes out at 0.3. This is a very low correlation, closer to a random scatter than an even loose association.

Ditto to those who support more parenting by the parents, and less by the government.

Crazed Rabbit