Respectfully, I disagree with some of your take. JP has made it a point to "poke" Iowa from day one. It is not a reach for Hawk fans to see wearing the all black unis this week would be intended to incite and fuel the rivalry even further.
The rivalry is already "stoked" to levels I have never seen in over 50 years of living. An already emotional week, combined with other societal factors, will not take much to create a truly hostile environment. I don't mean hostile the way we usually use it with sports. I mean hostile as in potentially violent. Anything, not just uniform choices, can push it over the edge.