There’s been several studies done that show Black NFL head coaches get held to a higher standard and don’t get second chances at the same rate as White head coaches.
Mike Tomlin - The all time winningest Black head coach works for the owner the Rooney rule is named after.
Tony Dungy - The 2nd all time winningest Black head coach was fired after three consecutive winning seasons for the organization that to this day still has the worst winning percentage in NFL history. He did get another chance, never had another losing record, went to 2 Super Bowls, won 1, and was inducted into the Hall of Fame after retirement.
Marvin Lewis - The third winningest Black head coach might be the exception that proves the rule. 16 years without a playoff win, all with the same franchise.
Dennis Green - The fourth winningest Black head coach coached 9 seasons without a losing record and was fired after his first losing record. He was then out of coaching for 2 years before being brought back by a moribund franchise and only given three years to right the ship before being fired. He never got another coaching gig.
Lovie Smith - The fifth winningest Black coach took his team to their only Super Bowl appearance in the last 35+ years and was fired after a 10-6 record. He was later hired by the aforementioned losingest franchise in NFL history and was only given two years to turn the franchise around. He’s now an NFL DC.
Jim Caldwell - The 6th winningest Black coach had two winning seasons and then got fired for having a losing season when his star QB got hurt. He was out of coaching for a couple years then got hired by a joke of a franchise, had winning records in three of his four seasons there, including his last two, but was fired. That franchise has not won more than 6 games in a season since.
Art Shell - The 7th winningest Black coach had winning seasons in 5 of 6 seasons, including his last two, and was never worse than 7-9. He waited 12 seasons to get another HC gig and was only given one season to win for a franchise that had 5 or fewer wins in the 3 seasons before he got there and would do the same in the 3 seasons after he was fired.