In rap you can verbally (story telling) kill as many blacks as you want. No limit on that. Blacks in rap have verbally shot each other 1000s of times.
Now, try saying you will kill a white person? Not allowed at all. There is a story that a rapper, could be Jay Z, can't recall, but the rapper was huge, big name and he had a rap about killing his white label boss if he didn't get his residuals and they made him take it out.
Let's say you had a rap about someone trying to jack you, or home invade you and you killed him. Real talk, would any label let that person be white? I guarantee you if he was a Black crack addict, you would not even think about a rapper not being able to kill him in a rap and there would be zero issues about it, but if the rapper said some white meth head was trying to home invade and he killed him, would that be allowed? . Is the energy to allow it the same? Maybe..its a maybe. And just because its a maybe tells you everything.
We are not allowed to story tell / rap lyrics kill anyone but ourselves and if we do, its going to be controversial or watered down. White rappers have 'murdered' blacks as well as whites on wax.