Are there correlations between high media use and attitudes about violence?

Answer 1

aggressive behavior, desensitization to violence, fear, depression, nightmares, and sleep disturbances. More than 3500 research studies have examined the association between media violence and violent behavior; all but 18 have shown a positive relationship. Consistent and strong
The associations between media exposure and increases in aggression have been found in population-based investigations of violence in American society, cross-cultural studies, experimental and “natural” laboratory research, and longitudinal studies that show that aggressive behavior associated with media exposure persists for decades.
Read about it in the classic study here: http://pediatrics.aappublications.org/content/108/5/1222