Exactly. Unless he does it on video (ala Ray Rice). The Cowboys and Bengals have hired the scum of the Earth, with the league's blessing, but suddenly they're concerned about fan reaction? Sorry, no.
Well, the difference here is that he's a QB. In the NFL, it's fine to be a controversial LB or Corner. But a backup QB is expected to put the team first, support management and the starter QB, and be quiet. No NFL team want's a backup who will outshine the starter. My team, the Seahawks, was very interested in signing him. But we interviewed him. Found out that he wants to be a starter. Or he wants starter money. Well, we have Wilson. Colin isn't nearly as good as Wilson.
Colin is essentially a black Tim Teabow. Not very good. Good enough to be a backup. But he carries so much baggage that most teams don't want the drama. Teams will put up with drama, if you're very very good.