Why wouldn't the Green Bay Packers allow their entire team to participate in Media Day?

The Packers didn't fly those on injured reserve or back-ups to Dallas with the rest of the team. They are missing much of the Super Bowl festivities. I think that is a horrible way for a team to treat its players. This was the first time a team didn't take their team picture on media day. The Packers couldn't because the rest of the team doesn't fly down until later this week. The Super Bowl may be a once in a lifetime experience. Too bad Green Bay doens't think enough about all their players to allow them to enjoy it. Anyone agree?