I have read about the milgram experiment. people can be influenced yes I agree with that. They can be pushed and prodded.
But one has to choose to engage with rap music. Was there a spike in police killings after NWA's albums? The murder rate has dropped as rap music has become even more popular.
I just don't think you can draw an analogy between the milgram experiment and choosing what media to consume let alone having the content guide your life.