Yer entitled to your own speech pattern, and the values of a lot of rap (the ho', killah parts) don't sit well by me, but English has always been an actively evolving language - and as often as not (or more often) the impetus for change has come from the outer rungs of the socio-economic ladder driving its way into the mainstream (often in active protest and to make a statement of asserting a culture)...
...whether from American Colonial English (detested by the British authorities, and clung to with vigor partly because of it).. ..or Cockney, or coming from Canberra, Kerry, Carolina or Compton ... ..all of which have radically changed the dictionary in England (and the US) over time.
As has technology, science, the age of exploration and more. Get in a time machine go to Victorian England and start blathering about "gigs of RAM," mobos, modems, chipsets, LOL, OMG and such and see who would think YOU were speaking "the mother tongue."
And if English had stopped morphing at a certain point (as kings and others have tried to force it to) we'd all be talking like, what, Chaucer?
So for you to say "Ebonics is probably spoken more than English in the US" is a "false non-equivalence" as what you're (implicitly derisively IMO) saying is that those identified with hip-hop culture aren't speaking English, when the truth is (or be if you don't prefer, haha) they're just not speaking your preferred dialect of English, rather theirs. And they're entitled in this semi-democracy as well...
And as for not making a contribution, consider how many rap artists are using a vocabulary as large as or larger than, yeah, William Shakespeare, who kinda (re)-wrote the book on neologisms (new made up words) in English...
See, e.g., "The Largest Vocabulary in Hip Hop."
So, no, dude, you don't own the English language.
Nobody does (or has) and that's really part of the beauty of it... ...and why English (in all its thousands of variants all evolving on their own as their speakers decide) has become "the world's second language."
Thats fine and dandy and easy for you to say since you speak very intelligently, but the fact of the matter, in todays world, unless you miraculously make it as a rapper or an athlete, ebonics = no job.