Why has the 'Rooney Rule' not produced more Black coaches?

Pittsburgh Steelers head coach Mike Tomlin watches from the sideline during the first half of an NFL wild-card playoff football game against the Kansas City Chiefs, Sunday, Jan. 16, 2022, in Kansas City, Mo. (AP Photo/Travis Heying)

FILE - These are 31 of the 32 NFL football team head coaches as of Feb. 10, 2022. The Minnesota Vikings head coaching position is currently vacant. Top row from left are Cardinals' Kliff Kingsbury, Falcons' Arthur Smith, Ravens' John Harbaugh, Bills' Sean McDermott, Panthers' Matt Rhule, Bengals' Zac Taylor, Browns' Kevin Stefanski and Bears' Matt Eberflus. Second row from left are Cowboys' Mike McCarthy, Broncos' Nathaniel Hackett, Lions' Dan Campbell, Packers' Matt LaFleur, Texans' Lovie Smith, Colts' Frank Reich, Jaguars' Doug Pederson and Chiefs' Andy Reid. Third row from left are Raiders' Josh McDaniels, Chargers' Brandon Staley, Rams' Sean McVay, Dolphins' Mike McDaniel, Patriot's Bill Belichick, Saints' Dennis Allen, Giants' Brian Daboll and Jets' Robert Saleh. Bottom row from left are Eagles' Nick Sirianni, Steelers' Mike Tomlin, 49ers' Kyle Shanahan, Seahawks' Pete Carroll, Buccaneers' Bruce Arians, Titans' Mike Vrabel and Commanders' Ron Rivera. (AP Photo/File)

New Houston Texans NFL football team head coach Lovie Smith gets up from an interview with Texans TV after an introductory press conference, Tuesday, Feb. 8, 2022, at NRG Stadium in Houston. (Brett Coomer/Houston Chronicle via AP)