If they won’t release stats on who is committing the crimes, stats on who is charged are not relevant.
How exactly do they determine "who is committing the crimes" if they don't have sufficient evidence to charge people? Is there a crystal ball that says what race committed every crime even if the case is never prosecuted? If so, can it give other information to help police identify the perpetrator so they can be charged? I'm not sure what you're trying to say here, but the words you used don't make sense.
This is the very problem with crime statistics though. They can only show the information that public safety agencies have, and that information will 100% be skewed if there is a systemic problem.
You don't even need the cops to be inherently racist; that's the problem with systemic issues. If the statistics show blacks are more likely to commit crimes, police will be swayed by those statistics and direct policing, resources, investigations, suspicion, etc accordingly. As a result more black people are likely to get stopped, searched, questioned, etc. This leads to three issues that exacerbate the problem:
1) the people stopped get charged with crimes unrelated to what they were initially stopped for, making a higher rate of "known crime", though the same rate is crime might be seen if they stopped other groups as much
2) crimes believed to be committed by the targeted group get closed more often ("closed" not "solved" as plenty of people are charged or even convicted and are later acquitted)
3) increase police presence in areas with higher populations of residents of the targeted group in an effort to "curb crime" results in more crimes being reported/closed involving that group
All 3 skew the statistics more and continue to perpetuate the cycle that caused the issue in the first place. As a result, perfectly reasonable, non-racist police and non-racist politicians push policies and activities and investigations that not only apply justice unevenly, but encourage and justify this uneven application.
This is the issue that cannot be solved by statistics. Do black communities, by and large, have higher crime? Is this an issue with "black culture"? Is the legal system justifiably using resources disproportionately? Or rather is it the system itself, after years of skew (which almost certainly did come from a racist place initially), making the statistics appear to imply that?
The answer isn't going to be found in the statistics. Even the rank and file officer can't answer because if there is a systemic problem it is likely skewing their view as well. Academia suffers from the problem that it can't isolate the variables and therefore can't adequately study the issue. We have hypothesis and conjecture. Until a good mechanism for testing the theories emerges, that's all we have.