It's the Pittsburgh. It's the Raiders. It's the Steelers. It's the 70s. Ok, maybe it's not the 70s anymore, but for some of the older fans, it wasn't so long ago that these two teams were the most bitter of rivals. And the fact that the biggest highlight the Steelers have to celebrate the rivalry was a fluke controversial play that only happened because of a great defensive play by the Raiders.
The Raiders would get their revenge in 1977 and their dynasty would last well into the 80s after the Steelers dynasty of the 70s was long since past.