What these people did was wrong. Apparently very wrong. Did Dorrell do it. No. There have been other actions by players that were ethically or legally wrong. They have been listed here and Dorrell has been held responsible. Did he do any of them? No. The only measure by which you can hold him responsible is how he reacted to these situations.
If he coddled the offenders, excused their actions, or gave them second chances then you could condemn him. I have not seen a list covering these offenses.
When a young man enters a program, the coaches will often have few clues as to his ultimate character. At 17/18 the young man is still several years from being fully developed in his judgment. The coaching staffs only have several hours a day to monitor and shape their character.
To ask the coaching staffs of any school to prevent misbehavior is impossible. To ask them to discipline the miscreants is appropriate. This is the difference between Dorrell and Carroll. Carroll coddles them and gives them second chances. Dorrell does not, so far as I can see. A world of difference.