I find it hard to believe that video games (or movies, songs, novels, etc,) even extremely violent ones, could compel someone to murder unless they were already

I find it hard to believe that video games (or movies, songs, novels, etc,) even extremely violent ones, could compel someone to murder unless they were already seriously mentally ill. Such an ill person, deprived of violent media, would not miraculously be cured nor would they pose any less a risk to those around them.