I am still trying to find those masses of "anti AB" folks that people keep talking about. I have seen a couple posters but most reasonable people acknowledge that he will end up on the exempt list within hours or days of being signed which makes signing him unfortunately pointless.
About 95% here would ecstatic if he would be back on the roster and actually be allowed to play out the season. Who wouldn't ?
But it is pretty obvious this is not what the expectations among the NFL teams is. There are 29 other teams (minus Oakland, Pats and Steelers) that have no historic roadblock to sign him and yet nobody does. Not even a workout.
You just need to use Occam's Razor here and go for the simplest most reasonable explanation for why a HoF WR in his prime remains unsigned.