I know that some will jump to this conclusion, but the Steelers don't look at skin color... They had one of the first black QB's in the league (who started over Bradshaw) and the "Rooney Rule" regarding minority coaches is a landmark for the NFL.
The Steelers always have their rationale, and it usually works. Yeah, I'm disappointed in that a 5th rounder seems like they got screwed, but there might be more to this story... But who knows. The NFL is a strange league...