Are most successful coaches "mean?"

[xztop12]

Well it has to do with the nature of the sport. For instance, I'm positive i'd make a good coach but I couldn't deal with seeing guys i invested effort and time into getting hurt and ruining their bodies/careers. It's the nature of the beast and you have to be somewhat cold to watch a guy you drafted and studied since HS go down with a torn ACL and call a play right after