What if the clubs just banned all crap music? That would eliminate rap entirely.
I wonder what they would think of ordinary Power Metal? Quite often that advocates killing dragons, demons and even Orcs. "In Flames you Burn", by Dream Evil seems to advocate beheading everyone in the world. God knows what they would think of the wonderful Dragonforce, who suggest that you should always ride everywhere with your sword held high. How lunatic is that?
It's a fine line, but I really don't think that this particular piece of crap is much worse than most gangsta rap. It's all about drugs and anarchy. Not like the good old days of Hawkwind and the Sex Pistols.