I'm going to spell it out really slowly and clearly one last time.....
Even if blacks are even more racist than whites in this particular instance (interracial homicide)
(which I don't think you can really make a case for, despite the statistics, because they do not take into account other mitigating factors like poverty and anger over years of marginalization),
that does not mean that systemic racism against black people does not exist. It has no bearing whatsoever on hundreds of years of unequal access to education, housing, jobs, healthcare, etc. It has no bearing on police brutality and racial profiling.
One does not cancel out the other. They are two separate and different things that exist alongside each other and perhaps offer some nuance to the picture, but one does not erase the other.
If you stole my skateboard and I stole your bike, the fact that I stole something of more value does not negate or cancel out that you unfairly lost your skateboard. See how that works..... ?
Probably not, but then again, logic really isn't your forte.