OT Some time back, Obdicut asked for evidence on the question of offender, arrest, and conviction rates.

Historically, crime statistics have played a central role in the discussion of the relationship between race and crime in the United States.[10] As they have been designed to record information not only on the kinds of crimes committed, but also on the individuals involved in crime, criminologists and sociologists have and continue to use crime rate statistics to make general statements regarding the racial demographics of crime-related phenomena such as victimization, arrests, prosecutions, convictions, and incarceration. As such, statements regarding the relative representation of racial groups in official crime rate statistics are not controversial. Regardless of their views regarding causation, scholars acknowledge that some racial and ethnic minorities are disproportionately represented in the arrest and victimization reports which are used to compile crime rate statistics.[11] There is, however, a great deal of debate regarding the causes of that disproportionality.

Wikipedia. Emphasis mine. source…

As to victimless crimes, I make no claims. Without victim reports, there can be no solid ground for judging whether arrest and conviction rates truly reflect offense rates.