I can understand what you're saying, and I won't flame you at all for it.
Like many things, a lot of things are attributed to race that would more accurately attributed to socio-economic status. If you want to analyze it then where has the "rap culture" come from?
You say it's from blacks, well where did they get it? Did they bring it from Africa? Hip-hop was born of jazz, dance music and *gasp* rock 'n' roll.
The first rap album to sell 1 million (platinum):
"The King of Rock
" - Run D.M.C. 1985
D.M.C. of Run DMC has the best quote (albeit a concise one) about this issue. When the B-Boys were first getting big the whole "white rapper" idea was new and revolted against, and when asked why they let the B-Boys play before them at their shows he said something to the effect of, "They bring people to the shows and the people like what they hear. That is what music is about. They are white boys, yeah, but as long as they sing about white boy stuff they'll be fine." Remember, this is 1985/6.
That's why they flourished, that's why they sell millions of records over a decade after their first multi-platinum album in the record industry where new acts are shuffled in and out monthly.
They made good music and told good stories. They had fun lyrics and didn't rely on one gimmick to sell records, which the vast majority of rappers (and rockers) do. And they fizzle out.
It's not arbitrary that some rappers make it and some don't. It's not just about who has got the most booty hoes in their video or who got the richest quickest. Master P was huge for a year or so but now he can't give his new album away. He's got booty ho videos with a diamond-encrusted tank and everything.
I have liked hip-hop since I can remember liking music. I broke my Teddy Ruxpin making him rock out to Bruce Springsteen and Public Enemy.
I can identify with a lot of it, because it's farce and all there really is to identify is with the emotion. When I was really young rap was about fun (B-Boys) or having a message (P.E.). That changed when rap started getting more complex, when rapping over guitar riffs went out I didn't like new rap anymore, because it was all black rage rap.
Tupac, Notorious B.I.G., N.W.A., Ice T, Ice Cube, etc... are about very specific situations. The message wasn't universal anymore nor was it anything you could sympathize with like Public Enemy would present. I can't get into anything Tupac says because I'm not his audience.
However, don't relegate the entire genre of hip-hop to Tupac. Oddly enough, the song I'm listening to while I type this entirely-too-long post is dealing with this very issue:
"White America" - EminemLook at these eyes, baby blue, baby
just like yourself
If they were brown, Shady lose
Shady sits on the shelf
But Shady's cute, Shady knew
Shady's dimples would help
Let's do the math, if I was black
I would have sold half
See the problem is
I speak to suburban kids
who otherwise wouldn't even know
these words exist
whose moms never would have never
gave two squirts of piss
till I created all this mother****in' turbulence
straight out the tube and into
your living rooms I came
And kids flippe when they knew
I was produced by Dre
That's all it took, and they were
instantly hooked right in
And they connected with me, too,
because I look like them.
I think I like too many different types of music, it gets tiring.