If a black person killed someone close to me and I released my newest single about how I want to murder black people would it get published? Doubt it.
Besides it's not like cops are allowed to kill black people either.
And if a black person does kill someone you love, why would you even think about black people in the same way as cops, when “black people” aren’t some public entity armed by the state to do the job of protecting people of all colors? You’re misrepresenting the issue. The only way to channel your hatred against an ethnic group that doesn’t have statutory power over you is to become racist.
But they de facto are in many cases. Cops can generally kill at will and without real justification and not face consequences. It's only in rare cases when public outcry is enough, like in the slaying of George Floyd, where prosecutors will even attempt to hold cops accountable.
https://www.nbcnews.com/news/nbcblk/report-black-people-are-...
And on average White Americans still live longer than Blacks, though the gap isn't as stark as it once was.
https://www.humanprogress.org/dataset/u-s-life-expectancy-at...
Bob Dylan told them he'd "stand over their grave to make sure that you're dead." Springstein disparaged congressmen's children.
If cops get protection from hate speech... why not politicians?
In fact, you'd have a much harder time than the rapper in OP's post - who actually did get his published.