Harrison is the Steelers' all-time leader in sacks with 80.5.
That anger will likely only grow amongst Steelers fans today, as it is being reported that Harrison is now visiting with the team that beat Pittsburgh just a few weeks ago to move into first place in the AFC.More news: One million cases in Yemen cholera crisis
Harrison signing with the Patriots isn't just a fit from a narrative standpoint, though that alone is enough to get me excited about the possibility. He also spent the 2013 season with the Bengals. He knows what's going on in their locker room. Harrison isn't a game-changer, but he can help.
Harrison might not like to hear any of that and might get angry if the opportunity to get back at his longtime team never materializes, but the business of the National Football League always trumps what happens on the field. However, adding some depth would make sense as the defense has shown some signs of slowing down in recent weeks after looking to have gotten things on track.
The Patriots are in a position to benefit from help at the line-backing level with Kyle Van Noy dealing injury and Dont'a Hightower sidelined for the season. But rest assured they didn't do it for the reason you're thinking.