Why wouldn't he try to convince his son not to play? The majority of whom Warren has been speaking with has determined it's not safe to play, which is why the season has been cancelled.
I have zero problem with a black man being in charge, and was a fan of the Warren hire at the beginning. What does race have to do with any of this?
Warren's number 1 job is to communicate with everyone, and make sure they are all on the same page. Moving forward with the season, then abruptly cancelling it a few days later, with presidents, ADs, coaches, and Warren not all on the same page of how that decision was made, is a huge failure of communication by Warren.