If his victims had been white, maybe. But they weren't. Abuse of black girls and women is at the bottom of the heap of what American society is willing to ignore.
Whatever the reasons for R. Kelly being given a pass for his decades of crimes against children, his blackness isn't it. It''s more like no one cared about or believed his victims until now.
That's a nice unfalsifiable theory you got there.
If a black criminal is prosecuted, it's b/c they are black.
If they are not, it's b/c their victims are black.
No, it is nearly certain that Kelly got a pass b/c he was black.
The NAACP gave him 7 IMAGE awards for being a black role model.
Another 25 of his awards would not have been given to him if he wasn't black, such as those from BET, Black REAL, and BMI "Urban". These are awards decided by and given to almost exclusively black artists in front of almost entirely black audiences.
The majority of his remaining awards were given to him as a "Hip-Hop" artists due to his sales and popularity among his overwhelmingly black fans.
In sum, nearly all his awards, success, and money while being a convicted violent criminal and known child molester has been due to support from other blacks, where his own blackness was central to that support.
The support he has gotten is likely a combination of two overall factors: 1) Many in the black community dismissing the convictions and accusations as being racial bias against him, and 2) The fact that his music exists in a genre where criminal violence and abuse of women is celebrated and honored, and many of it's performers have criminal records and history of violence against women.