In Sack's defense, it is pretty difficult for a person to admit they were a dirty player. I'm sure he could have just tackled Jerry Rice too instead of shredding his knee. The Steelers have guys like this too, just ask Carson Palmer or whoever it is Harrison has knocked out with his tackling "techinique".
The last time Sack played in Lambeau, he was a Raider, and I so wanted him to be carted off on a stretcher. I was younger then with less life experience; maybe we should forgive and forget. I must admit to this day, I try and listen to Warren's commentary - but I never make it through it without thinking of Clifton.