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The NFL party line, as articulated by Commissioner Roger Goodell, is that Colin Kaepernick’s unemployment is football related, Giants owner John Mara has acknowledged off-field concerns contributing as well.

Mara told Jenny Vrentas of TheMMQB.com that the Giants didn’t discuss signing Kaepernick this offseason, and that they’ve heard from many fans who would be angry if they did.

“All my years being in the league, I never received more emotional mail from people than I did about that issue,” Mara said. “If any of your players ever do that, we are never coming to another Giants game. It wasn’t one or two letters. It was a lot. It’s an emotional, emotional issue for a lot of people, moreso than any other issue I’ve run into.”

The Giants signed kicker Josh Brown to a new contract after he was arrested for domestic violence, and kept him on the team last year after he was suspended for domestic violence. It’s extraordinary that Mara says he heard from more fans about Kaepernick — a player on another team, who didn’t do anything illegal — than about Brown.

Mara’s comments say a lot about Kaepernick’s continuing unemployment: For many teams, the decision not to sign Kaepernick may go beyond whether the coach or G.M. think Kaepernick can help on the field. It may go up to the owner, who fears Kaepernick would hurt the franchise off the field.