I think you're confusing your chicken and the egg story.
Couple quick things. It's been proven by the numbers, and makes logical sense given population numbers, that whites commit as many, if not more, crimes.
Okay, so let's say your argument, then is that more specifically, a white person is less likely to attempt to flee. Well, then you'd have to make the assumption that each race views the risks of fleeing or not fleeing equally. That's simply not the case. I'm trying to keep this point brief, so if you'd like me to explain why, I can later.