Did rock and roll dillute it?

Didn't white people steal the black mans music meaning I like pure Rhythm and Blues and not motown pop music and soul music.I think that rock and roll was basically white people doing R%26amp;B and messing up the edgeness of it and most people believe this!Did rock and roll dillute it?
Chuck Berry. The father of rock n' roll. He was black. 'Nuff said.