I can't fully explain why violent crime is mostly confined to one group, but you cannot deny the fact that it is.
I said that it wasn't a racial thing (skin color, genetic make up), rather it was cultural. You debated that sentiment, then went on to state statistics that "Blacks" commit more crimes., etc. If you are arguing against it NOT being racial, then you are arguing that it IS about race. Couching it in the term "Ethnic Group" doesn't change things.
That's about as accurate as it gets.