Jerod was getting fired either way. There was too much fire between the media and fanbase wanting him gone. Bob doesn't like looking bad, so he needed a scapegoat.
He knew he was getting fired, which was why he did what he did week 18 against the Bills being so aggressive while the Bills where just trying to get the game over with. Jerod, once again, put himself in front of the team and wanted to win to screw over the Kraft's. While Tom Brady didn't comment directly on the Pats week 18 win, he did say those kinds of wins don't do anything for the next season. There is no such thing as "building for next season".
He's a piece of chit.