I suppose my internal debate comes from whether gangsta rap is a cause of the degradation of parts of our society or if gangsta rap is the result of the same....
I would say both, a vicious circle. One that's difficult to escape to be sure, if you aren't in, you are an outcast, like a conservative Person of color. It's a supply and demand kind of thing. If you can supply something more extreme and there's a huge demand for it, not only will you provide it, but you will work on the next level of extreme when the initial becomes common place and boring and the demand for it wanes. Imo Society is addicted to entertainment and attention. Children will seek attention even if it's negative.
If you consider who is popular and some consider influential, not all of them are good people. Family values, honor and respect are all but a thing of the past and I believe all these negative things are intertwined and pure poison.
back to your point Why is it "cool" for us to rap about killing each other? I could be they are embracing victim-hood, though it's not clear why you'd take that out on your fellow person.
I'll have to think on that some more. It's possible the rap is actually about the cultural struggle and they are just misinterpreting the message but I don't know as I'm not familiar with Rap.
Is there one specific song you think is the best representation of what you are talking about, and what exactly are the words at issue?
Seems I recall there was a 17 year old, recently who shot it out with the cops saying he wasn't going back to jail. For an alarming number (imo) life has little to no meaning for them, their's or others.