It's not the cause, it's a contributing factor.
I went over this with Replicant already.
A shitty white kid is more likely to get help than a shitty black kid.
It's not about the good kiRAB or the really bad ones, those exist in all cultures and get the same treatment. A good black kid will get out of a bad situation, and a bad white kid will sink himself into the bad one.
However, when a kid commits a durab offense like smoking weed, and is arrested because he's more likely to be targeted than a white kid in the suburbs committing the same crime, he gets put in juvie (at least when I did research in the trial court of MA) 75% of the time. A white kid committing the same crime? Probation/community service 75% of the time.
That's where it gets fucked up.