Article tells me you want to win, cheat. ;)
I also noticed that two or three of the "innocents" (NWern, Stanford and maybe BC) focus more on academics than winning. Less pressure on coaches equates to cleaner programs.
I can't speak knowledgeably about Northwestern and BC, but I do know that at Stanford there is plenty of pressure on coaches. Indeed, Stanford hasn't been very patient with coaches who don't win big. (As I recall the school ranks first or second in all-time NCAA national team sport championships.) As to football I do believe it likely that Stanford has been spared some player behavior problems because of its adherence to its academic standards.
A friend of mine's son graduated from Stanford last year and got drafted into the NFL.
Stanford montiored his academics from the time he committed.They made sure he knew they didn't want a Senior Slump.
They were also up front with him about his choice of majors.
He originally wanted to go Pre-med.They told him that, even though he came from one of the best Catholic high schools in N.J.,with his grades and S.A.T. scores they didn't think he could handle both football and a Pre-med course load.
He took their advise,majored in Business and graduated in 4 years.