After seeing multiple players on the Nashville Predators sporting Mohawk hair cuts in the 2012 Stanley Cup playoffs, my initial reaction was "You look like a goofball. I hope you lose". That was how I felt seeing Brian McCabe's multi-colour mohawk once upon a time in Toronto, and it is how I feel today. Just because McCabe did it, doesn't make it cool. If anything that precludes it from being cool. If I owned a professional hockey team, I would institute a team rule banning mohawks, and if that cost us a free agent or two, so be it. I'd specifically put a stipulation in every player contract that no player will receive a salary for any duration of time that they sport a mohawk, and any no movement clauses are immediately voided.
Aboriginal players would have a mohawk exemption. A native with a mohawk is scary. A white man with a mohawk is a goof.
My ban would even include "The Mr T"