Yes they do, and it doesn't bother me.
Basically the way I look at it is, if I didn't get myself into the "automatically-accept" pile, that's my fault. If I end up in the maybe pile, it's hard for me to believe that the reason I don't eventually move from maybe to yes is that there are a huge pile of minorities who get let in ahead of me.
I mean seriously, look at the total number of URMs that end up at each school. It's way more likely that you're not going to get off the waitlist because some adcomm didn't get laid the night before they reviewed your application.
Bottom line: if you didn't get yourself into the "presumed admit" pile, it's nobody's fault but your own. If you're in the maybe pile, you're opening yourself up to the whims of adcomms.