It's a leftwing craze that has been building for decades now: that the white man has literally stolen all of his ideas from the superior darkie races. Indoor plumbing, cell phones, the internet, automobiles, gasoline, sliced bread- all were thought up by darkies long ago, only for the evil white man to swoop in and steal it. The same thinking is applied to whites in history: for example, the Greek philosophers simply plundered their knowledge from the libraries of Alexandria and passed it off as their own. Obviously, none of this is given a shred of proof beyond "how dare you question this you racist."
Back on topic: Billy is fat and nobody will have sex with him, so he has to lure little children who don't know better.