so what your saying is if someone is violient it is because they like rap 
no.
everyone who listens to rap, is not necessarily violent.
however id say honestly that probably 90+% of the people who commit petty crimes in this country- theft, mugging, stealing cars, vandalism, burglary, hell even most of the worse stuff like drive bys, random shootings, rape, hell throw every fucking crime you want in there- would say that rap is their 'music' of choice and that they would most associate with that sort of lifestyle and culture.
put it this way...if right now everyone who had bought (or stole LOL) more than, say, 5 hiphop albums in the last 6 months was rounded up and put into camps, I WOULD BET MY LIFE that overall crime in the city would drop at least 50-60%.