This man and his rants (raps) are so extreme that he's secured the interest of German security officials. These security officials have said that Cuspert is an 'influential figure who incites violence and unrest through inflammatory videos and fiery speeches that praise terrorists and attack the West'. So, instead of rap about killing, say, a rival gang member or whatnot, this guy talks about killing infidels instead. Whichever way you slice it, the man is inciting violence. He is, in other words, inciting 'hate crimes' and is, in fact, a Hate Criminal.
These German security officials also said that the hate crimes of this man inspired the fatal shooting of two American airmen at the Frankfurt airport in March. The killer was inspired, more precisely, by a video of Cuspert's he had just seen.
So we must fight 'hate crime' in all its forms - even if it's Muslims who are committing them.