I think any music that encourages violence against anyone else should be banned - the thing is, most rap songs don't encourage actual violence against real people.
The lyrics do seem to glorify violence, though.
However, haven't we been here before?
There is no link between pornography and men who rape women, from what I remember.
There is no link between people who watch horror films and violent crime.
Can't people listen to rap, with the strongest of lyrics, without murdering a bunch of people?
I mean, it can't be a legitimate excuse, can it - a young thug arrested for attempted murder, and the guy says 'well, I listen to rap music, you see, and the lyrics told me to do it'