I think your perspective would suddenly become a lot more sympathetic if the Steelers were playing in February, potentially about to win an NFL-record 7th Super Bowl (and leaving the Patriots behind).
You are wrong.
Of the potential match-ups, I would be rooting for the Steelers at least 25% of the time. I want the NEP to win more sb, but i really don't care if the steelers get another. While I do root against the steelers somewhat often, it isn't about nep getting 7 first but rather it is because my bil is a steelers fan.
I am sure there are some nep fans that think that way, but as I said no fan base confuses other teams loses as there own teams wins to the extent dolphin fans do.